33.70 mm x 27.80 mm (outside), 30.50 mm x 21.50 mm (inside) T-shape plastic flange type Original crystal, Waltham® REF 00.0909, 00.0430
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Waltham®. Waltham® warranty does not apply to parts supplied by H. & W. Perrin Company Limited.