G-S Flexo Cylinder Watch Crystal CMY137 for Gruen

If you're working on a vintage Gruen watch, this G-S Flexo cylinder crystal might be exactly what you need. It's a genuine replacement part, model CMY137, measuring 13.4 by 10.9 mm. These are known for their optical precision and are a staple for anyone doing watch restoration. It's still in its original paper sleeve, so it's been well-protected over the years. New old stock.