G-S Flexo Watch Crystal Y613 for Longines Fulton

If you're working on a vintage Longines Fulton, this is a genuine G-S Flexo crystal in its original paper sleeve. It's the Y613 model, measuring 20.9 by 19.1. These old-school acrylic crystals are great because they have that classic look and are pretty easy to work with. It's new old stock, so it's never been used and is ready for a restoration project.