... for the air command I read about this:
300 meter proved by Blancpain for the older ones. The screwed pushers for the chronograph are not made by Blancpain itelf and garantie is only given for 200 meters from the firm which make/made them.
My air command has the Nr 22x and has the first insert. I got a replacement one 10 years later which I coated black. This is the newer version !
great posting
best Stephan