Borel P 410 - 44½ Lentille - Chevee 41.0mm Acrylic Pocket Watch Crystal - New

J. Borel P 410 - 44½ Lentille (which means lens) Chevee (which, in this context, means slight depression) acrylic Pocket Wrist Watch Crystal, 41.0mm diameter, new in envelope.  Someone has altered the Dennison size by 1/4 size which I'm not sure that's entirely accurate, but it doesn't change the actual size in mm. These are clear NOS crystals and haven't been stored for 75+ years like other ones on eBay often are. Can supply just about any size Watch Crystal you need (acrylic or glass) so feel free to inquire. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.