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STUNNING 19th C BRASS WATCHMAKERS' JUMP / PROPORTIONAL SECTOR RULE

STUNNING 19th C BRASS WATCHMAKERS' JUMP / PROPORTIONAL SECTOR RULE

$325.00 USD

12 5/8" long. Stamped 'GPP' near the main joining screw. Knurling on both knobs and adjustment screw are extremely fine and crisp. Fine overall condition.