I am not sure whether this is a wristwatch or a small pocket watch as the crown is at 12 o’clock. It has a cylinder escapement, which was only used until the early 20th century as it is not very efficient.
Dial with the crown at 12 o’clock
Hour hand
Dial removed
Hour and minute wheels removed
The cannon pinion is in a recess, making it very difficult to get leverage with either a special hand removal tool or hand removing levers
Keyless works
Crown, stem, winding and sliding pinions
Top side with the full movement
Crown and ratchet wheels
Click and spring
Gear train
Centre and third wheels bridge
Centre and third wheels
The escape wheel overlaps a lot more with the balance wheel than with a lever escapement
Escape wheel and balance wheel
Regulator
Balance removed, escape wheel exposed
The teeth are not flat but have a characteristic shape
