Patek Philippe

patrick_y
[PuristSPro Moderator]
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Ahh, you bring up a good point. Let's compare the 5140 and 5236 models a bit more closely.

So, the base caliber 240 and the base caliber 260 are 2.4mm thick and 2.6mm thick respectively. So, theoretically, a time-only watch would have a movement around this thickness; and the difference is only 0.2mm. Now; the 240Q and the 260 PS QL have modules on top of their base calibers. The perpetual calendar moonphase module on top of the 240Q only adds about 1.5 mm! Incredible! The perpetual calendar moonphase with small seconds module added onto the 260 base module more than doubles the thickness! So it's not entirely fair nor accurate to compare the whole thing to the whole thing; since the newer perpetual calendar module has the in-line display that does take up more space than the old perpetual calendar module that came out in the 1970s/1980s in the 240 caliber.