Ladies Omega without a serial number

The serial numbers of that vintage were on a 'sticker' like thing inside of that large empty hole next to the crown wheel (the big indent next to where it says 625). Unfortunately this means that you don't really have a way to get the serial number.

The reference number has sellers claiming this from reference from the 1950s to 1990, so I dont think we'll have a good way of knowing how old it is unless someone with some good knowledge shows up! I DO think the sticker-version of the serial number DOES age it into the late-70s at minimum though.

Was going to note that the SN was on a sticker. Erich beat me to it.

I too am one of the rare female watch collectors. It does give one a lot of options with the smaller dials. So much of the popular stuff is quite large. Although I do find that my Speedy and Chronostop do wear small. My favorites are the 18mm ladymatics, which have the same build quality as the under 30mm 55x/56x.

The 620 and 625 are also 18mm. Down side is they are only two handers. The more rare 630/635 is a pretty decent three handers. For some reason the 67x and chronometer grade 68x tend to show up more often. I like having the sweep hand. Date not so much so. Automatic does not make much sense when one does not wear the watch often. The nicer watches do tend to be automatics.

The small cocktail movements like the 650 and the oval and rectangular movements, tend to show up the most often. Probably as the cases trended to gold and diamond.

Thats a good point, probably pushes it to the 80s/90s timeframe then.

Right, I'm guessing the sticker got lost in a previous service in a cleaning machine/etc. The sticker is supposed to be in that big empty circular depression on the movement (next to where it says 625).

The sticker fell off. It was in the circular indentation.