Antique pre Civil War 1857 1 Cavity. 460 Diameter Bullet Mold

Antique pre-civil war bullet mold with. 460 diameter possibly for 1851 Colt.

Also, there seems to be an M stamped, which could mean Merrill Firearms Company or Massachusetts arms company or potentially M can stand for Military or something government issued. This mold is in pristine condition for its age.

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