Rolex 1600-311, Mainspring, generic

• Swiss made Rolex generic mainspring.

• Fits cal: 1600, 1601, 1602

Versions:

• 1600:       17/19 jewels, 19.800 A/h.
• 1601:       19/20 jewels, 19.800 A/h.
• 1602:       20 jewels, 21.600 A/h.