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It seems to be a ref. CK 2366

 

From the omega.ch vintage database: 

Reference number: CK 2366 
Movement 

* Caliber number: 30 T2 RG 
* Created in 1943 
16 or 17 jewels 

Dial 

Not available 
Crystal 

Hesalite 
Bracelet 

Leather 
Water resistance 

No 
Case details 

Stainless steel 
* Press-in 
* Full metal 

Functions 

Chronometer, Subsecond 
More product information 

Case : round (35,5 mm diameter) 
For leather straps of 18 mm lug-size 
International Collection : 1943-1958 
Swiss retail price (1946) : CHF 202.- 
Also available in stainless steel with 14K gold bezel and lugs (CO 2366, CHF 250.-), in 14K solid gold (OJ 2366, CHF 475.-) and in 18K solid gold (OT 2366, CHF 556.-). 
Same watch as ref. 2527 but with chronometer certification. 

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