Zenith 660-721, Balance, compete

• ZENITH original balance, complete in factory sealed packkaging as pictured.
  

• ZENITH part number: 56.80.0360.660
  

• Fits all calibers from: 650 to 693
  

Versions: Manual wind:

• 650: date.
  
• 655: no seconds dispaly, date, power reserve.
  

Versions: Automatic wind:

• 660: no seconds display, date (never produced).
  
• 661: no seconds display.
  
• 665: no seconds display, date , power reserve (produced?)
  
• 670: sweep second, date.
  
• 672: sweep second, date, dual time
  
• 680: sub second, date.
  
• 682: sub second, date, dual time
  
• 683: power reserve, 24 h display
  
• 684: sub second, date window at "6"
  
• 685: sub second, date, power reserve.
  
• 687: sub second, power reserve, dual time, dual time, 24 h display
• 688: similar to 687?
  
• 689: hour, minute diplay.
• 690: moon phase at "6"
• 691: moon phase at "6", big date.
• 692: moon phase at "6"
• 693: 24 h hand.