Omega 331-1100, Ratchet wheel

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  NOS OMEGA original part, not in factory packaging.

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  Fits cal: 331, 333, 341, 343, 352 Chronometers.

Versions with sub second from 1949.

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  330: D=30,10, shock protected, antimagnetic, H=4,55 mm.
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  331: D=30,10, centenary chronometer, antimagnetic.
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  332: D=30,10, antimagnetic, redesign 331.
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  333: D=30,10, exenter regulator, chronometer.
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  340: D=28,10, shock protected, antimagnetic, H=4,80 mm.
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  341: D=28,10, centenary chronometer, antimagnetic.
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  342: D=28,10, shock protected, antimagnetic, redesign 340.
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  343: D=28,10, exenter regulator, chronometer.
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  344: D=28,10, swan neck regulator.

Versions with center second from 1949.

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  350: D=28,10, shock protected, antimagnetic, H=5,40 mm.
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  351: D=28,10, shock protected, antimagnetic, redesign 350.
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  352: D=28,10, exenter regulator, chronometer.
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  353: D=28,10, shock protected, antimagnetic, date, H=6,10 mm.
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  354: D=28,10, swan neck regulator.
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  355: D=28,10, date, redesign 353.