OMEGA cal: 17'''

Manufactured from 1901 in quality A - C.

movement, no: 5 159 561 manufactured in aprox: 1915

Data: OMEGA 17'''LOB

• 15 jewels, open face caliber, sub second.
• Size: 17'''  37.60 mm.
• H: = 5.05 mm.
• N: = 18.000 A/h.
• Balance staff: DCN no: 40
• Power reserve: -- h.
• Mainspring: 2,00 x 14.5 - 0,20 - 400 (Measured and verified)

Versions: L = Lépine, O = Omega caliber, S = Savonette, A - C = Quality/Grade, NN = new negative wind/setting mechanism.

Grades:

• A: 7 jewels, flat hairspring, compensating balance.
• B: 15 jewels, Breguet hairspring, compensating balance.
• C: 15 - 19 jewels, regulator adjuster with screw or snail-star wheel, 7-8 collets.

How to identify the OMEGA 17''' LOB, Measures:

• The pallet cock is fixed with one screw.
• Total diameter of the crown wheel is: 9.90 mm.
• Total diameter of the ratchet wheel is: 13.50 mm.
• Total diameter of the barrel is: 12.50 mm.
• Balance staff height: 4.56 mm.

Versions:

• 17'''LOA:      7 jewels, flat hairspring. 1898 - 1906
• 17'''LOB:    15 jewels, Breguet hairpspring. 1898 - 1932
• 17'''LOC:    15-19 jewels, Breguet hairspring, regulator, geneva stopwork.
  
• 17'''BULL:   21 jewels, Chronometre.