I bought this watch in 2015 from @NT931 here on the omega forums. You can search his sales thread to see his photos as well!

I've worn it sparingly over the last 2.5 years usually with a shirt and suit and very carefully. Given the square case it wears like a 36mm round watch (wristshot attached).

The details:
-Ref 161.021, dates to 1966
-Calibre 711 ‘Super-flat’. 3mm thick only. I had this watch serviced in December at a local watchmaker just for maintenance.
-Size: 28.5 mm square (excl crown), 36.5 mm lug tip to tip. Case is really nice and not overpolished at all.
-Thickness 8.5mm including crystal
-20 mm lug width
-Dial is original and in great shape.

Photographed on a brown croco strap from IWC which is not included. Sale for watch head only.

Priced at 550 USD which is what I paid for it in 2015. You get the service for free!











I took the following two photos at the watchmaker just before the service. Movement looks super clean.