| Unidentified photographer Repeating tintype gem portraits n.d. Tintype National Museum of American History, Smithsonian Institution ID Number: PG.77.74.14, accession number: 1977.0916, catalog number: 77.74.14 LL/98063 19 gem-sized tintype portraits of a man on a single sheet of iron; 1 of the 20 originally exposed has been cut out, in the lower right corner.
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