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First use of chromium plating by US Mint - 1929 Ecuador dies and collars
RogerB
Posts: 8,852 ✭✭✭✭✭
This page from the Philadelphia Mint's Engraving Department might be of interest to collectors of Ecuadorean coinage.
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RogerB
Posts: 8,852 ✭✭✭✭✭
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What about the 1927 "Specimen" Buffalo Nickels?
https://coins.ha.com/itm/proof-buffalo-nickels/1927-special-strike-5c-sp65-pcgs/a/1124-2168.s
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
Following discussions with BEP, the US Mint bought used chromium plating equipment from BEP and began testing it at Philadelphia. The 1927 nickels were test pieces made from chromium plated dies. The have all the advantages and defects of plating in that time period. The Mint used plated collars and dies on a few other foreign coins, but the cost was probably considered excessive. (A working die cost about $35.)
Some of the 1943 cent dies used at all three mints were chromium plated, but the work was done at the National Bureau of Standards in Washington, DC. Plating improved release of zinc-coated steel coins and significantly reduced clogging.