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Watch case back showing engraved numbers

Authentication Guide

Reading Reference and Serial Numbers: A Practical Framework

Reference numbers describe what the watch is; serial numbers describe when it was made. Learning to read both is the fastest way to move from beginner to informed collector.

May 2, 20269 min read

Extreme macro of gold hallmark stamps and assay marks inside a vintage watch case back

Authentication Guide

Reading Hallmarks and Case-Maker Marks: The Overlooked Authentication Layer

Precious metal hallmarks and case-maker punches are among the most reliable dating tools available, and among the least studied by collectors focused on dials and movements.

July 20, 202611 min read