Crown Vintage Glass Pocket Watch Crystal 17-7/16 (~39.3mm) - NOS

Crown Vintage Glass Pocket Watch Crystal size 17-7/16 = ~39.3mm (marked) with a thickness of ~1.1mm.  Mi-Concave profile with a small bevel, typical of what originally came on vintage pocket watches.  While still likely well over 100 years old, 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. That said, they are quite likely very dirty and need serious cleaning.  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.