Master Coin Circular
U.S. Mint [Fixed Price List], U.S. Mint (1859)
Memo from U.S. Mint Director James Ross Snowden regarding the offering of master coins ("proofs" in modern parlance). From the National Archives and Records Administration, record group 104 (U.S. Mint), entry 1 (general correspondence). Courtesy of Roger W. Burdette.
Note transcription on p. 2.
See also the Snowden circular of May 21, 1859 (https://nnp.wustl.edu/library/publisherdetail/534123).