There is a moment every currency collector eventually faces: you are holding what appears to be a stunning, nearly perfect banknote. The paper crackles with original crispness, the ink pops with vivid color, and the margins are bold and even. Then you tilt it under a raking light source and there it is, a faint diagonal crease cutting across one corner. Welcome to the About Uncirculated 55 grade, arguably the most emotionally frustrating and financially consequential single step in the entire paper money grading scale.
Defining AU55: The Official Standard and What Graders Actually Look For
According to the Paper Money Guaranty (PMG) grading standards, an AU55 note must display only a single light fold or a very minor degree of handling. The critical word here is “light.” The fold at AU55 should not be a hard, sharp crease that has broken the paper fibers, but rather a gentle bend, often barely visible head-on and only clearly apparent under a 45-degree raking light. The note retains essentially all of its original paper body, meaning the stiffness and crispness that fresh paper money possesses when it leaves the Bureau of Engraving and Printing.
PCGS Currency uses nearly identical language in its own standards, emphasizing that an AU55 note shows only the slightest evidence of handling. Both services agree that the note should retain nearly full original brightness and that any soiling, foxing, or edge wear that goes beyond what that single handling episode would produce will disqualify a note from this grade. In practice, graders at both services spend significant time examining corners under magnification, because a corner fold is the single most common reason a note falls from Uncirculated to About Uncirculated.
The Raking Light Test
Professional graders hold notes at a low angle to a single directional light source, often a small LED lamp positioned to cast shadows across the surface of the paper. A fold that is nearly invisible under normal overhead lighting becomes dramatically apparent under raking light as a shadow line cutting diagonally across a corner. This is the same technique serious collectors should use when evaluating raw notes at shows or from dealers. A jeweler’s loupe at 5x magnification combined with raking light will reveal folds, counting creases, and pinholes that can instantly reframe a note’s grade.
When examining a raw note for potential AU55 issues, use a single-bulb LED flashlight held at a 30 to 45-degree angle to the note’s surface. Rotate the note through all four orientations. A fold that does not show up in one direction may be clearly visible when the light rakes across it from the perpendicular angle. Do this before purchasing any note priced at AU or Uncirculated levels.
AU55 vs. AU58: A Distinction Worth Real Money
The grading range between AU55 and AU58 is narrower than many collectors realize. PMG describes AU58 as a note with only the slightest evidence of handling, sometimes just a single corner tip fold so minor that it barely registers. An AU55, by contrast, has a fold that is definitively present and visible, even if it is light. The practical dollar difference between these two sub-grades can be significant on premium notes.
Consider the 1928 $100 Federal Reserve Note in Fine to Very Fine grades, a common enough type note. But at the AU level, a 1928-A $100 Chicago (G) district note graded AU58 by PMG can sell at auction for $450 to $600, while the same note in AU55 may bring only $300 to $375. That gap of roughly $150 to $200 on a single sub-grade difference illustrates why collectors and dealers pay such close attention to that crease. On rarer notes, the spreads become even more dramatic.
The Cost of That Corner Fold: Real-World Value Comparisons
Let us look at specific, well-documented series to quantify what the AU55 grade actually costs collectors compared to Uncirculated examples. The 1934-A $500 Federal Reserve Note is an instructive case. In the most recent major auction results from Heritage Auctions and Stack’s Bowers, an MS63 example of the Chicago district 1934-A $500 note has sold in the range of $4,500 to $5,500. An AU55 example of the same note from the same district typically brings $2,800 to $3,400, a discount of roughly 35 to 40 percent. For the same note in a scarcer district such as Minneapolis (I) or Dallas (K), the percentage discount for AU55 versus MS63 tends to widen because high-grade examples of those scarcer districts command especially fierce bidding among registry set collectors.
The Silver Certificate series offers another telling comparison. The 1896 $1 Educational Note, one of the most aesthetically celebrated designs in American currency history, is a perennial favorite. In MS63 EPQ (Exceptional Paper Quality), a 1896 $1 Educational has realized $1,800 to $2,400 at major auction. In AU55, the same note without the EPQ qualifier typically brings $700 to $900. Here the spread is enormous, partly because the EPQ designation at Uncirculated levels carries its own substantial premium, but also because the Educational Series attracts registry set competition that drives MS prices sharply higher. The AU55 collector is essentially excluded from that competition entirely.
For budget-conscious collectors, AU55 examples of visually spectacular type notes like the 1896 Educational Series or the 1886 $5 Silver Certificate with Morgan’s portrait on the reverse can represent outstanding value. You get essentially the same visual impact and originality as an Uncirculated example at a fraction of the price. The single light fold is often invisible without raking light, making these notes a practical choice for display collections where registry competition is not the goal.
Large Size Notes and the AU55 Grade: Particular Challenges
Large size currency, issued through 1928, presents particular challenges at the AU55 grade level because the sheer physical size of these notes, measuring approximately 7.375 by 3.125 inches, made them difficult to handle without bending. Collectors and bank tellers alike tended to fold large size notes at the corners simply to fit them into wallets and pockets. This means that a disproportionate number of surviving large size notes in otherwise high condition carry exactly the kind of light corner fold that defines AU55.
For the 1902 Plain Back $10 National Bank Note, for instance, certified AU55 examples are actually far more common in the marketplace than AU58 examples, because the grading increment from that persistent light corner fold to truly fold-free is a large physical hurdle for a note of this size and age. Collectors pursuing high-grade large size nationals should budget for the reality that AU55 may be the realistic ceiling for many charters, particularly from smaller towns with low circulation banks.
Star Notes and the AU55 Premium
Star notes, replacement notes identified by the star symbol at the beginning or end of their serial numbers, add another dimension to the AU55 discussion. Because star notes are produced in far smaller quantities than regular issue notes, the gap between an AU55 star and an MS63 star can be proportionally larger than for regular issue notes. A 1969-C $100 Federal Reserve Note star from the New York (B) district in MS63 has brought $400 to $550 at auction. The same note in AU55 typically brings $175 to $240. For rarer star notes with print runs under 640,000, that percentage gap often widens further because registry-competitive collectors specifically target the highest achievable grade.
When building a star note collection on a budget, AU55 examples of low-print-run stars can be a smart entry point. Once you have identified which specific star notes you want and what a realistic grade ceiling looks like for that print run, you can decide whether upgrading to a Uncirculated example justifies the premium. Check the PMG and PCGS population reports before bidding: if only two or three examples exist above AU58, an AU55 example may be the only realistic option for years.
How Pressing and Cleaning Can Mimic or Mask AU55
One of the most important practical skills for any collector working in the AU55 to Uncirculated range is recognizing artificially improved notes. Pressing, the practice of using heat and pressure or chemical softeners to relax and remove folds from currency, is the most common form of alteration encountered at this grade level. A pressed note that was originally graded Extremely Fine 40 or 45 can sometimes be made to look deceptively like an AU55 or even AU58.
Both PMG and PCGS Currency will designate a note as “Apparent” if they detect pressing or cleaning, which effectively removes it from the standard population and dramatically reduces its market value. A 1934-C $20 Federal Reserve Note that would be worth $85 to $120 in genuine AU55 condition might bring only $30 to $50 as an AU55 Apparent due to pressing. The telltale signs of pressing include unnaturally flat paper with reduced body, a slightly glazed or waxy surface sheen, and fold lines that look softened rather than crisply defined. Learning to detect these characteristics is an essential skill for any collector buying raw notes.
| Series / Note | Type or District | PMG AU55 Pop. | Rarity at AU55+ |
|---|---|---|---|
| 1896 $1 Silver Certificate (Educational) | Type Note | Approx. 80 certified AU55-58 | Scarce |
| 1928 $500 Federal Reserve Note | Boston (A) District | Fewer than 20 at AU55 or above | Rare |
| 1934-A $500 Federal Reserve Note | Minneapolis (I) District | Fewer than 12 at AU55 or above | Key Date |
| 1969-C $100 FRN Star Note | New York (B) District | Approx. 35-50 at AU55 | Scarce |
| 1902 Plain Back $10 National Bank Note | Small Town Charters | Highly variable by charter | Rare |
| 1934-C $20 Federal Reserve Note | All Districts | Several hundred across districts | Common |
| 1886 $5 Silver Certificate (Morgan Back) | Type Note | Approx. 25-40 at AU55 | Rare |
| Series 1995 $1 FRN Star Note | Atlanta (F) District | Print run 128,000; under 15 certified AU55+ | Key Date |
Should You Buy AU55 or Hold Out for Uncirculated?
This is the question that every collector in this grade range must answer based on their own goals, budget, and the specific note in question. There is no universal right answer, but there are useful frameworks.
For type collectors building a representative collection of designs, series, and denominations, AU55 examples often represent the sweet spot of value. You get a note that is visually impressive, certifiably original, and clearly of high quality, at a price point that leaves room to acquire more notes. The 1875 $1 Legal Tender Note in AU55, for example, is an attainable goal for a collector of modest means, while the MS63 example of the same note might require $1,500 to $2,000 or more depending on the Friedberg catalog variety.
For registry set collectors competing for the highest certified grade within a specific series or district, AU55 is almost never a satisfactory destination. Registry competition is entirely about grade supremacy, and an AU55 note will sit below every AU58, MS61, MS62, MS63, and MS64 example in the same category. If registry competition is your goal, budget accordingly for Uncirculated examples, or choose a registry category where the grade ceiling is naturally limited by survival rates.
For investors treating high-grade currency as an alternative asset, the conventional wisdom has generally been to focus on MS63 and above with EPQ designations, since those grades have historically shown the strongest appreciation and the most liquid secondary markets. AU55 notes tend to trade more slowly and with wider bid-ask spreads than their Uncirculated counterparts.
Conclusion: Respecting the Grade for What It Is
The AU55 grade should not be viewed as a consolation prize or a near-miss. It is a legitimate grade designation that describes a specific, real condition: a note that was handled once, lightly, and has otherwise survived in exceptional original condition. For the right collector with the right goals, an AU55 example of a key series note is a meaningful acquisition that connects directly to the history and artistry of American paper money.
Understanding exactly what puts a note at AU55, how to detect the defining fold yourself, and how the grade affects value across different series will make you a more confident buyer, a sharper negotiator at shows and auctions, and ultimately a more satisfied collector. That single corner fold tells a story: someone, at some point, handled this piece of history with just enough care to preserve it almost perfectly. There is something genuinely human about that.
