The caliber M33 ist the maximum enhanced base caliber M24 with added center second, jumping date, weekday and selfwindung mechanism. With a diameter of 29mm and a height of 6mm it looks impressive.
The selfwinding mechanism is as simple as ingenious: With a simple excenter changer, the mainspring is wound directly without any transmission gears inbetween.
Nickel anular balance|
|Balance bearing / direction hairspring:||Bridge|
|Adjust mechanism:||Hairspring key|