Rolex® calibre 400 lower end piece
Genuine, Rolex ® part # 3074 regulator for breguet hairspring 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.