Swiss Made 1600-1803 Mainspring Strength-Standard for Rolex Manual Winding Movement. Mainspring #770
For Caliber Numbers: 1600, 1601, 1602
***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.***


