Circle Brand Vintage Glass Watch Crystal 17-9/16 (39.8mm) - NOS

Circle Brand Vintage Glass Watch Crystal size 17 9/16 = ~39.8mm (marked) with a thickness of ~1.35mm, new old stock.  These come from glass crystal cabinets that are easily well over 80 years old, so they give real meaning to the term NOS. That said, in my 40 years of experience with them I've not found the older crystals to be any more or less brittle than anything you could find today. I likely have several of these so the one you get may differ slightly from the images. I have a supply of crystals that numbers in the hundreds of thousands so I can usually supply just about any size Watch Crystal you need (glass or acrylic) so feel free to inquire. Images do an adequate job of representing the item.