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Message:: [QUOTE="robc, post: 1122065, member: 29686"]I was the primary research metallurgist for the coinage materials INCO developed in 1963-65. The primary development work was done in INCO's Bayonne NJ Research lab but a little work was done in INCO's Huntington WV facilities. The piece referred to  above was probably a test piece that the Huntington people used to test the alloys and production procedures we developed in Bayonne.  I retained Gilroy Roberts to develop our Paul D Merica dies and all the test pieces were done either at Bayonne or at Sterling Forest Lab when that opened in mid 1964.  I was at the 1965 Washington Treasury US Mint meeting when we introduced the Ni Si permalloy coinage material.  We were developing the currently used Cu clad cupronickel at the same time.  The alloy development was designed to the test parameters that coinage vending machines utilized to verify the authenticity of the 10, 25 and 50 cent US coins. The US mint became aware of the clad material we developed in 1965 and DuPont's cladding process was one of the production methods evaluated. It was an interesting time that changed coinage collection very quickly. I just joined cointalk to see what is being said today about what happened in 1964-66. I hope this helps answers questions raised several years ago.[/QUOTE]