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Marks on American pewter
American pewterers used touch marks, quality marks and, occasionally, hallmarks that are broadly similar to those used by British pewterers.
Ledly I. Laughlin has written an excellent guide to Pewter In America.
Pewter In America; Its Makers and Their Marks
Ledly I. Laughlin, Barre Publishers, Barre, Massachusetts, 1981, ISBN 0 517 350637.
Three volumes in-one.