G-S Flexo Watch Crystal Y278-10 for Gruen Vanity

This is a vintage G-S Flexo watch crystal, specifically model Y278-10. It's designed for a Gruen "Vanity" watch and measures 13.2 by 10.6 mm. Still in its original paper envelope, it's a great find for anyone doing a restoration on an old Gruen piece. New old stock. It's a specific part, so make sure the dimensions match what you need.