Rolex® calibre 400 upper balance hole jewel
Genuine, Rolex ® part # 3110 cannon pinion ht. 2.60mm fits Rolex® 400, Rolex® 420
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Rolex®. Rolex® warranty does not apply to parts supplied by H. & W. Perrin Company Limited. Using generic parts may devalue your watch.