24.38 mm x 19.18 mm x 0.80 mm (thick) rectangular shape flat mineral crystal with rounded corners, generic (not original), Longines® REF 2477. Using generic crystals may devalue your watch.
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Longines®. Longines® warranty does not apply to parts supplied by pplied by H. & W. Perrin Company Limited.