I may be a novice here but isn't there a screw missing on this movement? Recently serviced!

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Yes. Either picture was taken prior to service (that ain't a new gasket either...) or by "Recently serviced" the seller means sometimes in the 1970's... Which is pretty "recent" considering the earth is about 4.5 Billion years old...

 

Yes, one of the screws that holds the movement to the enlargement ring is missing. Everyone has a different definition of "serviced."

 

Well I may be wrong but I always assumed that this seller is a watchmaker himself.......