High Quality Swiss Made Part 3135-311 Mainspring Strength Standard for Rolex Watches. These are direct replacement and will work for all Rolex caliber 3135, 3155, 3175.
***Time Connection II Inc. is independent of and not affiliated with or sponsored by Rolex Watch U.S.A. Inc. Rolex warranty does not apply to non-genuine parts supplied by Time Connection II Inc.***


