Omega 20''' LOB

The Omega 20''' was available from 1898 as Lépine or Savonette in grades A - C, D, DDR, BULL. The parts are the same as for the Omega 19'''

Example movement:

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  No: 4 125 030, signed Omega on the train wheel bridge and plate. Manufactured in aprox: 1914

Data: Omega 20''' LOB

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  15 jewels, open face caliber, sub second.
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  Size: 20''' 44.8 mm.
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  H: = 6.85 mm.
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  N: = 18.000 A/h.
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  Power reserve: 38 h.
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  Mainspring: 2,60 x 18 - 0,20 - 570 mm, AT Double brace and hole.

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

Grades:

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  A: 7 jewels, flat hairspring, compensating balance.
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  B: 15 jewels, Breguet hairspring, compensating balance.
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  C: 15 - 19 jewels, regulator adjuster with screw or snail-star wheel, 7-8 collets.
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  CC: Fine C quality.
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  CCC: Very fine CC quality for 19 and 20'''
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  CCR: Extra fine CC quality for 19 and 20'''
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  CCCR: 23 jewels, 15 collets for 19 and 20''', official chronometer.
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  DDR: 23 jewels, 18 collets for 19 and 20''', official chronometer, after 1922 signed Very Best.