Certainly this watch is well known to the forum, but I'm just so enamored of it that I feel compelled to give a bit of a tour. 
Beautiful sculpted case, and curved rear crystal (although that doesn't make any difference in comfort to me vs flat). This pusher adjusts the leap year indicator.
Date is changed through the crown.
Nice finishing, and particularly like the year indicator on the movement side - keeps the dial side clean. Serial number removed in photoshop - it's really there 


7 day power reserve - keeps time quite evenly throughout the range, and keeps going reasonably well for another 2-3 days past that. The months are indicated by the small hand pointing at the 6 in the picture below. The absence of a day indication keeps the dial clean, although it is occasionally missed! The range of the PR indicator is quite small... fully wound up is at the top line, after 7 days about even with the middle line. The one time I let is run all the way down, didn't quite make it to the bottom line. Winding the watch is a pleasure - about 50 turns of the crown, takes about 35 - 45 seconds. Now part of the weekend ritual.
Here's how they achieve the big date - two overlapping date rings. This is from the catalog for the Monard Date model, which has the date window at 6, so the numbers are rotated to reflect that - but it's the same concept. The size of the date took some getting used to at first. The "feature" of this system is that the date is always centered in the aperture - other big dates with two rings for the units and tens have to show either a blank space or a zero on the tens wheel. Not that a GO or Lange is hard to look at
If you examine the watch on the wrist, you can see in the second half of the month that the date wheel is a tiny bit lower in the aperture, and the edges of opening of the upper date wheel if you look at it sideways.

