just checked, and yes, the markings "Portrait" is actually a part of the petzval parts - and that makes the portrait longer than in "landscape" mode...
the 5 cells (beautifully made!!) have numbers on them:
the sixth one looke slightly different - has no numbers, and looks like a cell to be put at the back of the barrel (?)
8 watehouse stops with the numbers:
2-5-6-7-12-15-18-29 (maybe millimeters? the biggest numbers has the biggest hole)