Five tips on how to date a vintage brooch…. with pictures to help! – The Jewellery Muse
16 Locking Pin Badge Back Brass Fastener Clasp Keeper Uniform Metal Brooch Clasp | eBay
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Dating Brooches by Clasp Fastenings - AC Silver
DATING BROOCH FASTENERS - Global Gemology - Rare Gems & Jewels