cazalea[Seiko Moderator]
20750
Look how the dials vary!
My perpetual in the middle has Dec at 12 o'clock on the month subdial above 6. Yours has January at 12 o'clock. And your moon subdial at the top is larger.
My months, days and dates are flipped at the bottom and yours are not.
Interesting! My watch was built about 2000 or so.
Mike