Ref. 7707BB
There are a few makers that took a shot at doing a perpetual calendar in a line, and I got to say the cleanliness of this one is really appealing to me Glad you like it, it deserves love
Indeed, I learned a few things
Gotta say I like the Type XX 3803 - my size and it ties back to the aircraft instrument and has that pear shaped crown (And no date window!) ...
This is one of my all-time favorite perpetual calendars
You do NOT need to think past this! There's nothing in the Type XX line that comes close (and I say that as a very satisfied owner of one).