Does anyone know this Omega's ref ?

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Hi,

I just wanted to know if anyone has a UK Omega catalogue where could be found the ref. of this little Omega from 1940 (it's a 9ct gold Dennison cased, cal. 23.4 with a size without crown of ≈29mm)

Thanks
 
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There is no reference.
It’s a Dennison cased watch without a reference.