FRN collecting – US Notes

Series 1934 Federal Reserve Notes: Light vs. Dark Green Seal Varieties Explained by Denomination

June 15, 2026June 15, 2026 by

The Series 1934 Federal Reserve Notes produced one of the most fascinating and debated varieties in 20th-century American paper money: the shift from dark green to light green Treasury seals and serial numbers. Understanding which denominations exist in each variety, why the change happened, and what collectors should look for can transform a routine type set into a genuinely rewarding specialty.

Transitional Series Mule Notes Between 1950 and 1950A: Identifying the Mixed Plate Printings

June 15, 2026 by

When the Bureau of Engraving and Printing shifted from Series 1950 to Series 1950A Federal Reserve Notes, a brief window of mixed plate usage created a fascinating category of mule notes that puzzle collectors to this day. Learn how to identify these transitional printings, which signature and plate combinations to watch for, and why certain district mules command significant premiums over their standard counterparts.