Hi everybody, I'm looking to replace the crystal on mine with a sapphire jobbie from AliExpress or somewhere.

Does anyone know the diameter of the crystal? I haven't got any calipers to measure and, tbh, I can't be bothered to buy one as I have a crystal press I use for Vostoks, but as they are like Lego no measurements are needed ever and everything else I have is sapphire. Damn Bulova for not going sapphire!