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Opened July 1999, zOwie is the Internet's first and longest running discussion forum dedicated to Omega brand watches.

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Re: Seamaster Pro 300 Chronograph - S/N vs Year Made
In Response To: Seamaster Pro 300 Chronograph - S/N vs Year Made ()

Reference
2598.80.00
International collection
1993
Movement
Type: Automatic (mechanical)
Caliber number: 1154/1164
Cal. 1154
Created in 1992
25 jewels
Cal. 1164
Created in 1995
25 jewels

This basically means if you know your Cal number you can date it to 92-95 or 95+

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