1878 - S Acid Treated Dies
Attribution Guide #4 Acid Treated Dies With "R" in "Trust" Not Broken
Leroy Van Allen wrote an article about acid treated dies that appeared in 24 May 2011 VAM-e and also in the 2012 1878S Morgan Dollar Attribution Guide. He states that the following 78-S VAMs are acid treated -- 36, 48, 49, 50, 55, 75A, 76, 81, 84, 91, and 91A.
Possible acid treated are 1B, 8A, 24, 30, 43, 69, and 102.
AG #4 Known Acid Treated Dies
1878-S VAM-8A Engraved Wing Feather, Rusted Die Wings
1878-S VAM-24 Doubled Liberty & Wheat Leaves, Engraved Wing Feather
1878-S VAM-30 Quadrupled Liberty, Doubled Nostril & Eyelid, Engraved Wing Feather
1878-S VAM-55 Sextupled Left Stars, Doubled Profile, Engraved Wing Feather
1878-S VAM-75A Doubled E L-BUS, UNUM, Engraved Wing Feather, Pitted Wings
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