BEADNOVA Brooch Pin Back 60pcs Bar Pin Back 1.5 Inch Clasp Pin Back Brooch Pin Backs for Crafts Badge Name Tag DIY Jewelry Making & Craft (60 Pcs, Silver Color), silver :
Dating Brooch Fasteners - 1850 to 1910
How to Identify and Date Old Brooch Styles
21mm Brooch Pin Finding with Bail
Brooches
Dating Brooches by Clasp or Fastening
Five tips on how to date a vintage brooch…. with pictures to help! – The Jewellery Muse Blog