I own a 1901(not as nice as yours) and I just wish it was a little bit larger. Even on my puny 6 1/2" wrist, it wears small. It's so charismatic with that tiny crown, I always enjoy winding it!
You'll be able to get a lot more info at Chinese Mechanical watches on the watchuseek forum. [Link to commercial seller removed, but watchuseek is appropriate - Mod.]
Only my Datejust, which was overhauled with all new O-rings and seals, as well as a new crystal; was pressure tested. I feel confident wearing it in any situation but as for the other Vintage watches, O-rings and seals may be hard to come by when overhauling them. I've never pressure tested them and