Could just be my aged eyes, but, especially in the unetched area between 1 & 3 o'clock, I think I see the little wriggly lines one sees in some...
The hinge & clasp do not appear to be replacements & are from well into the 20th century. Suppose the little scrimshaw plaque itself could be...
Whole mark is probably 1-20-12K GF.
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