- NM means "no monograms" are found on the piece(s).
- OM means "old marks". You often see this when an old Gorham piece is being offered. Gorham changed the information it placed on the backs of forks, spoons, etc. in 1950. If a seller places OM in the title, it probably means the Gorham piece(s) being offered were manufactured before 1950 and have the old Gorham hallmarks.
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