18.50 mm x 18.50 mm x 1.30 mm (height) square domed top flat bottom sapphire crystal, generic (not genuine), fits Cartier® Tank Francaise. Using generic crystals may devalue your watch.
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Cartier®. Cartier® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.