Omega 550-1208, Mainspring

• OMEGA original mainspring, comes in factory packaging as pictured.

• Fits cal: 550, 551, 552, 560, 561, 562, 563, 564, 565, 750, 751, 752

Versions without date:

• 550: 17 jewels.
• 551: 24 jewels, chronometer.
• 552: 24 jewels.

Versions with date:

• 560: 17 jewels.
• 561: 24 jewels, chronometer.
• 562: 24 jewels.
• 563: 24 jewels, quick set date.
• 564: 24 jewels, quick set date, chronometer.
• 565: 24 jewels, quick set date.
• 750: 17 jewels, day, date.
• 751: 24 jewels, day, date, chronometer.
• 752: 24 jewels, day, date.