From my research, I also found ref.2627 without both words but with “
swiss made” at 6 o’clock.
The serial no. was low as 12,529,xxx too.
I believe it was original dial but “WRIGHT ….” below AUTOMATIC was added later ?
So I believe that early seamaster calendar (date at 6 o’clock) without both seamaster and calendar can be found in both Swiss and Swiss made.
Teerapat