Brand new reproduction mineral glass replacement. Made out of Hardlex, the original material Seiko used. This is the correct crystal used for 6309, 6306, and 7548 dive watches made between 1976 until the late 1980s. It is by far the most commonly used crystal watches and has been unavailable for more than 30 years.
1.5mm Thick at center
This crystal is made to fit Seiko watches
6309-7290 / 729A / 729B
This listing is for the crystal only, not the display watch