Thoughts about Omega Geneve Dynamic..

Did you try tool 107 as a search parameter?

I just got a ladies model without day date for cheap. Spread across 3 auctions I have about 160USD in it, unserviced. Such includes an extra 566-0015 core.

There are some sellers asking gents prices for ladies models. I noticed in my searches that a lot of sellers use the marks on the back thinking that is a case ref number.

Most examples I am seeing have just the date window. I am not a fan of date windows. I have been following closely dynamic listing as I have a cracked 30mm dial with no date window. Searching info on these is tricky as the same case core is used for different models.

There is a chart somewhere that decodes the first three numbers. 1 is gents 5 is ladies, I forget what the other two are. Sometimes one can play around with these numbers on the omega vintage site. I have not opened my case yet but I suspect it i s a 565-0015 note that the omega vintage site search needs all four digits for the last group of numbers with the hyphen in between.

This is some reference data I have been using:
CASE REF 566.015 caliber 680/681 670 no date (Dm= 17.5mm, Do= 18.0mm H= 5.3mm)

CASE REF 166.039 165.039 135.033 136.033 caliber 550/552/565 750 600/601 (Dm= 27.9mm, Do= 28.4mm H= 4.5mm)

I did a search on sold listings for omega dynamic day date and got back a caliber reference of 1022. Looking up on ranfft, would put the wach in the 1972 to 1984 era. Using this a a ref we can then come up with a possible omega case ref ST 166-0108
https://www.omegawatches.com/watch-omega-geneve-dynamic-i-st-166-0108

This in turn gives us some sold listings

just for fun when I clicked on the active link I got this. Not sure it is real, but outside my budget

Opening these is not easy. I got the tool and have the spare case to practice on. I am not going to open mine until I am ready to work on it. I did figure yours was the larger gents watch as I do not think there is a day/date in the smaller calibers. Of course I am often wrong. Some of this is subtle like the separation between the day and date. I am not quite sure what I will do with my dial which is for the larger style. Perhaps some day I will find one that needs a dial (without date opening.)
-j