31.90 mm x 31.90 mm (outside) / 30.80 mm x 30.80 mm (inside) square acrylic crystal supplied with a gasket, generic (not original to fit to fit Tag® Monaco. Using generic crystals may devalue your watch.
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Tag Heuer®. Tag Heuer® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.