Heh, I had the same issue when wanting to open mine
Yours is a 132.019, which I also mentioned in your original post - here is my FS post:
https://omegaforums.net/threads/omega-132-019-w-box-original-strap-and-buckle.59954/
There is a small cut-out at around 10 o'clock on the rear of the watch where you should be able to get a case opener in to prise off the case back. It is not a front loader...
My example had been opened at one point and the case back had gotten turned, so the cut-out was at 3 o'clock - where the crown is
There is a cut-out on the side of the bezel, too. This is for removing bezel + crystal.
Click to expand...