24.70 mm outside diameter, low profile plastic crystal, 22.50 mm opening diameter of the inside ring, yellow ring with radium dots (Mido® colour 20-R), 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.