31.60 mm round plastic crystal, grooved on the side, does not include the tension ring, you will need to use to old tension ring, this is a generic replacement (not original) for the Omega® crystal number PX5072 and PZ5072. Using generic crystals may devalue your watch.
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Omega®. Omega® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.