i recently purchased this vintage omega Geneve automatic ladies watch and have very little information on it. I was told by the seller it is a cal 565 and gold plated. For a cal 565 there is a quick set for the date however this one does not have that feature. I believe it is a cal 584 with no quick set.

The diameter including the crown is about 22mm and the strap from between the lugs is about 10mm.

The strap is not an original.

 

It is definitely not a Cal. 565 as the 565 is just about 28mm in diameter. I have never heard of this 584 cal. but I am just a novice. My guess is it is either a 630 or 635 but that is just a guess. You need to look inside the case back to get the reference number. Not much help but that's all I have.