CK 2009 cal. 23.4 Scarab style?

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Hi!

I have purchased this nice Scarab style Omega from 1937.

I have tried to figure out the reference and i think it is a CK 2009 but not sure.

Facts:
28,5 mm ex crown
Movement stamped 23.4 under the bridge (I can se some mention CK 2009 as 23.4 SC)
Movement nr. 8520456 = +-1937
Medicus dial

any comments appreciated, old catalogs ect. ( @Tire-comedon )

Thanks

 
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Yes, it is a CK 2009.
Here in the 1940 catalog :
17100805542119182115307051.jpg

Mine says hello :
17100805542019182115307050.jpg