Here it is:Ref 145.016. Probably worth what the movement is worth. One of the cheaper ways to get a 861 donor movement.
The people here are obsessed with Speedmasters. This is actually a very nice Omega chrono, with a very good movement, at a decent price. It does everything a Speedy does, except have the magic name.
I would buy this for $600 any day of the week. I would call the 1.200 euro price fair, but on perhaps the very slightly higher than average side.
Paid $1925 for this CK2886, Seamaster, circa 1956ish, 321 caliber. I own lots of larger speedmasters but this smaller, 35mm piece runs and looks great. My wife enjoys wearing it.