Omega 490-1243, Fourth wheel, New

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  New original Omega part in factory sealed packaging.

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  Fits cal: 490, 491

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  470: 17 jewels (1955).
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  471: 19/20 jewels (1955).

Versions: 28.00 mm.

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  490: 17 jewels, sub second (1956).
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  491: 19 jewels, sub second (1956).
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  500: 17 jewels, center second (1956).
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  501: 20 jewels, center second (1956).
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  502: 17 jewels, center second, date (1956).
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  503: 19/20 jewels, center second, date (1956).
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  504: 24 jewels, center second, date, chronometer (1957).
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  505: 24 jewels, center second, chronometer (1957).