Decoding Jewelry Hallmarks & What They Tell You About Your Jewelry
SUPERFINDINGS 36PCS 7mm Number and Letter Stamp Set Black Carbon Steel Punch Set Letters A-Z and Numbers 0-9 Leather Craft Stamp Jewelry Metal Stamping Tools for Imprinting Metal Wood Plastic Leather :
Jewelry Maker's Mark | Antique Jewelry University
Antique and Vintage Jewelry Maker's Marks: A Collector's Guide - Invaluable