The Series 1950B $5 Federal Reserve Note Mule Varieties: How Late-Production Plates Created Transitional Collectibles

When Two Eras Collide: The Story Behind the 1950B $5 Mule

Walk through any currency show and you will find stacks of Series 1950B $5 Federal Reserve Notes in dealer boxes, most priced modestly and passed over by collectors hunting flashier rarities. But hidden among those ordinary notes is a subset that tells a quietly dramatic story about Bureau of Engraving and Printing plate management in the early 1950s: the mule variety. These transitional notes, produced when wide face plate numbers were paired with new small back plate numbers (or vice versa), represent one of the more accessible yet genuinely collectible specializations in the mid-century small-size Federal Reserve Note series.

What Exactly Is a Mule Note?

The term “mule” in paper money collecting borrows from the coin world, where it describes a piece struck from mismatched dies. For Federal Reserve Notes and other small-size U.S. currency, a mule is a note printed using one plate from an older production standard combined with a plate from a newer standard. The mismatch is not an error in the traditional sense; it was an entirely intentional, practical decision by the BEP to use existing serviceable plates until they wore out rather than retire them prematurely.

In the specific context of the Series 1950 through 1950E $5 notes, the transition that created mules involved a change in how plate numbers were printed on the face (obverse) of the note. Older face plates carried a wide, bold plate check number typically positioned in the lower right area of the note face. When the BEP introduced a new, smaller typeface for these plate numbers during the early-to-mid 1950s production cycle, there was an overlap period. Sheets printed during this overlap received one style on the face and the other on the back, creating the mule combination that collectors prize today.

The Series 1950B Signatures and Production Context

Series 1950B $5 Federal Reserve Notes bear the signatures of Ivy Baker Priest as Treasurer of the United States and George M. Humphrey as Secretary of the Treasury. Priest served from January 1953 through April 1961, while Humphrey occupied the Treasury Secretary role from January 1953 through July 1957. That relatively narrow window, roughly 1953 to 1957, encompasses the entire production run for the 1950B series across all twelve Federal Reserve districts.

The twelve issuing districts for the 1950B $5 are the standard ones: Boston (A), New York (B), Philadelphia (C), Cleveland (D), Richmond (E), Atlanta (F), Chicago (G), St. Louis (H), Minneapolis (I), Kansas City (J), Dallas (K), and San Francisco (L). Print runs varied considerably by district, and this variation is exactly where the rarity story for 1950B mules becomes interesting. High-volume districts like New York and Chicago produced enough notes that mule examples surface with reasonable frequency. Lower-volume districts produced fewer notes overall, meaning mule survivors from those districts are significantly scarcer even if the percentage of mule production was similar.

How the Plate Transition Actually Happened

Bureau of Engraving and Printing records, cross-referenced with the research of leading small-size note specialists including Chuck O’Donnell and later refined by contributors to the Society of Paper Money Collectors (SPMC) literature, indicate that the wide-to-small plate number transition on $5 Federal Reserve Notes took place progressively across press runs rather than at a single clean cutover date. This is critically important for collectors: the mule combination did not appear on one day and disappear the next. Instead, it appeared whenever a pressroom happened to load an older wide-face plate alongside a newer small-back plate, or the reverse configuration.

The back of the 1950B $5 features the Lincoln Memorial vignette that has appeared on this denomination since 1929. The back plate numbers sit in the lower right corner of the reverse, and during the transition period they shifted from a typeface consistent with the wide face numbering to a noticeably smaller, more condensed character set. Collectors have cataloged both possible mule configurations: wide face with small back (Type 1 mule, more common) and small face with wide back (Type 2 mule, considerably rarer and sometimes missed even by experienced collectors).

District-by-District Collecting Strategy

Building a complete set of Series 1950B $5 mule varieties by Federal Reserve district is a realistic goal for a dedicated specialist, though it will require patience and a willingness to examine notes carefully rather than relying on holder descriptions alone. Third-party grading services do not always note the mule attribution on the label, which means population data from PCGS Currency and PMG is incomplete for this variety. Heritage Auctions and Stack’s Bowers have sold attributed 1950B mule examples, and reviewing their realized price archives (available online back to the early 2000s) gives a solid baseline for current market values.

New York (B) district notes are the most available across all grades simply because of the enormous production volumes routed through that district during the 1953-1957 period. Chicago (G) and San Francisco (L) are also relatively accessible. On the other end of the spectrum, Minneapolis (I) and Dallas (K) district 1950B $5 notes are scarce in general, and confirmed mule examples from those districts in circulated grades above Very Fine command premiums that surprise collectors used to thinking of $5 notes as inexpensive. A Minneapolis mule example in Extremely Fine-40 can realistically trade at three to five times the price of an equivalent non-mule from the same district.

Grading Considerations Specific to 1950B Notes

Series 1950B $5 Federal Reserve Notes are approaching 70 years old, and original paper quality varies noticeably by district and even by print run. Notes from this era were printed on high-quality 75 percent cotton and 25 percent linen fiber stock, and survivors in original uncirculated condition display the crisp, slightly waxy surface feel that experienced collectors recognize immediately. The green Treasury seal on these notes, positioned to the right of Lincoln’s portrait, should retain strong color saturation in high-grade examples. Fading or lightening of the seal color is one indicator that a note may have been improperly stored or subjected to humidity, which also affects paper crispness.

For mule attribution purposes, grading condition interacts with collectibility in an important way. The plate numbers that define the mule variety are small and fine in detail. On heavily circulated notes in Good or Very Good condition, these numbers can be worn enough to make attribution uncertain. Collectors specializing in 1950B mules generally prefer to work with notes in Fine-12 or better condition simply to ensure the plate numbers remain legible and unambiguous. Notes in the Very Fine-20 to Extremely Fine-45 range represent the sweet spot for most budget-conscious specialists: affordable relative to CU examples, but with plate numbers sharp enough for confident attribution.

Values in Context: What Are 1950B Mules Worth?

Pricing 1950B $5 mule varieties requires triangulating several factors: district, star vs. regular issue, grade, and whether the note has been third-party attributed. As a general framework drawn from recent Heritage and Stack’s Bowers auction results as well as PCGS Currency and PMG population report data through 2023, the following ranges apply for attributed examples. Common district mules (New York, Chicago) in circulated grades of Fine to Very Fine trade between $25 and $75, a modest premium over non-mule counterparts at $10 to $30. The same districts in CU-63 to CU-65 EPQ range from $100 to $250 for attributed mule examples. Scarce district mules in Very Fine condition (Minneapolis, Dallas, Minneapolis star) can reach $150 to $400 depending on attribution confidence and demand. Unattributed notes examined at shows and confirmed as mules by the buyer before purchase represent the best value opportunities in this series.

Placing the 1950B Mule Within the Broader 1950-Series Story

The 1950B is not the only issue within the 1950 series to produce mule varieties. The Series 1950, 1950A, 1950C, and 1950D $5 notes all have documented mule examples across various denominations and districts. What makes the 1950B particularly attractive as a collecting focus is the combination of relatively accessible non-mule examples (keeping entry costs manageable) with genuinely rare mule varieties at the high end of the district and star-note spectrum. A collector can build an educationally rich type set that illustrates the plate-number transition using a budget that would not accommodate comparable depth in, say, the large-size Federal Reserve Note series.

The SPMC journal “Paper Money” has published several articles over the decades examining mule varieties across the 1950 series, and back issues available through the SPMC library represent required reading for anyone pursuing this specialty seriously. The Friedberg catalog (“Paper Money of the United States,” current 22nd edition) provides Friedberg numbers for the 1950B district notes (Friedberg numbers 1963-A through 1963-L for regular issues, with star notes cataloged separately) but does not break out mule varieties as distinct catalog entries, which is one reason these notes remain underappreciated relative to their actual scarcity.

Conclusion: An Underappreciated Corner Worth Exploring

The Series 1950B $5 Federal Reserve Note mule varieties occupy a quietly rewarding niche in mid-century U.S. currency collecting. They require genuine numismatic knowledge to find and attribute correctly, they reward patient searching through material most collectors ignore, and they offer a tangible connection to the BEP’s real-world production practices during the postwar era. Whether you are building a complete district set of mule varieties as a long-term project or simply want to understand what you might be holding in a box of circulated $5 notes, these transitional pieces repay close attention. The best finds in this specialty are not behind glass at major shows; they are in the boxes on the dealer tables, waiting for a collector who knows exactly what to look for.