Bulova® Case Back Gasket BU-G3033
o-ring, case reference 8420-1, 8421, 8421-1, 8442, outside diameter 27.50 mm, inside diameter 26.30 mm
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Bulova®. Bulova® warranty does not apply to parts supplied by H. & W. Perrin Company Limited. Using generic crystals may devalue your watch.