Incidentally, I had a "duh!" moment when I first started looking at these 431 watches. Some have the date window between 4 and 5 (which I sort of like because it's quirky), others have it at the more conventional 9 O'Clock position. Must be a slightly different movement surely..? 😁😁
(Obviously it doesn't matter where you put the window with respect to the date dial, you just need to set it right..)