30.90 mm WIDE RING outside diameter, low profile plastic crystal, 27.50 mm opening diameter of the inside ring yellow ring (Mido® colour 20), no minute track, original vintage Mido® crystal
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Mido®. Mido® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.