Bulova® Case Back Gasket BU-G721 case reference 2156 "His Excellency®"
o-ring, case reference 2156 "His Excellency®", outside diameter 32.75 mm, inside diameter 31.60 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.