I own one, it's a datejust, uncle grabbed it for me in Singapore maybe 10 years ago? It still one for my favorites, except the stem mechanism does not work correctly. My Apple Watch ended up replacing it for everyday use. I should open it up....
I don't know anything about movements other than what I can see through transparent backs and Wikipedia articles, but...they look sensitive to experimentation
It has a sweeping pattern, opposed to the "tick-tock", It's already broken, worst case its broken more :p I'll post some pictures later.