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<p>[QUOTE=&quot;desertgem, post: 1852725, member: 15199&quot;]Although the use of diamond dust in polishing is very common today, I am not sure when they switched from files or emery dust to diamond. The book on buffalo nickle proofs&nbsp; in 1936 indicated that previous trials that year produced a more satin finish and so due to public pressure then ( 1936) they switched polishing material and technique to produce mirror die finish. I had assumed that the use of the zinc laps with diamond dust started then as it had become a mainstay in the jewelery industry. I still suspect that neither of these 2 Morgans were die polished with laps and diamond dust, but I guess I need to find a Mint budget record to see what polishing materials were expensed as used. Anyone have one for 1900?[/QUOTE]</p><p><br /></p>

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