25.70 mm x 0.70 mm thick, flat, 12 sides, sapphire crystal, generic (not genuine). Using generic crystals may devalue your watch.
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Audemars Piguet®. Audemars Piguet® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.