I went back and forth about this but I want to move it to fund for next project. This is a 42mm first gen PO 2201.50 with rare Caliber 2500d variant with coaxial escapement before Omega’s 8500/8800 went super thick. For the curious: https://www.watchuseek.com/threads/...d-some-light-on-the-differences-in-the-various-2500-movements-b-c-d-etc.621621/ I have a hard time believing this watch is 600m rated while being so thin that it slips under the cuff, but that's what Omega did back in the days. I don't have the original clasp but it was modified quick adjust OTF Omega clasp for versatile environments where wrist circumference fluctuates throughout the day, which perfects this watch imho. Watch was last overhauled in 2023 (no record) and it works flawlessly with buttery crown action and perfect timekeeping within COSC. Price is $3,450 shipped insured to CONUS and international is extra. It also comes with an aftermarket “Omega” rubber fitted strap with deployant clasp, but I have an OEM one that is very nicely made for extra, which was near $600 for the strap and deployant. Let’s call it $350 extra. No trade unless you have 16570, 16750, 3711/3713. Thanks!