U.S. National Archives (Record Group 104, [Denver] Entry 19, Coinage Dies) Öffentlichkeit Deposited
Coinage die use at the Denver Mint, scanned at the National Archives and Records Administration (NARA) in Denver. Record group 104, entry 19.
NARA series description: This series consists of records of coinage dies used for the following denominations: double eagle, half eagle, half dollar, quarter dollar, and dime. Included are the dates the dies were used, the obverse and reverse die serial numbers, the number of pieces struck on each date of production, and the date the die was condemned.
The NARA catalog record is at https://catalog.archives.gov/id/2619093. See also the National Archives & Records Administration numismatic finding aids at https://nnp.wustl.edu/library/archivedetail/538870.