Both with original black dials and in stainless steel cases - one with a bumper movement and date at 6 and the other with a full rotor movement and date at 3.
I've not seen that before, either. I'm guessing here - trapezoid window, applied Omega, so calibre 355 and a late serial number?
The nice thing is because they have such chunky lugs they wear a fair bit bigger than a 34 and change watch typically does. Some of the Constellations with thin lugs can look really small on someone with large wrists like me but the Seamasters tend to work.