John Hosmer Hamlin
- Born: 24 Aug 1787, Providence RI
- Died: 9 Feb 1856, Providence RI
General notes:
Silversmith and engraver
Events in his life were:

- Alternate Mark.
It is not known if this mark was used by William or John or both.
- Partnership: William Hamlin, circa 1809-1819, in Providence RI. As W & J. H. HAMLIN. 4

- Example: Tradecard, circa 1809-1819, in American Antiquarian Society. 20
- Advertised: Providence Gazette, in 1809, in Providence RI. As W & J. H. HAMLIN, manufacturing nautical, mathmatical, and scientific instruments; gold and silver goods; general engraving. 4
- He appeared on the census in 1850 in Providence RI. Listed as a grocery.
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