Photograph of the engravers of the Philadelphia Mint. Top row (left to right): Charles Greth, John Beally, Harry Blythe, Charles Conway, James Blythe. Bottom row (left to right): William Key, Charles E. Barber, George T. Morgan, Unknown.
U.S. Mint
1910
Philadelphia Mint.  A slightly cropped version of this image appears on page 135 of David Lange's book <i>History of the United States Mint and Its Coinage</i>.  The credit, on page 190 is to "Denver Mint, U.S. Mint"