Omega® Crown Nut, calibres: 640, yellow

Yellow crown nut (slotted) for Omega® caliber 640 back wind, head diameter 2.00 mm, female thread, total height 1.46 mm

*Perrin Supply Ltd is independent of and not affiliated with or sponsored by Omega®. Omega® warranty does not apply to parts supplied byPerrin Supply Ltd. Using generic parts may devalue your watch.