four BPS would be 28,800. I don't think anyone is running any higher than that... (4 X 60 X 60 X 2)
The new co-axial runs at 25,200 which is 3.5 BPS...
Three BPS would be 21,600.
Rolex, pre- co-ax Omega, and Eta all run at 28,800 (except Speedy, which I think is 21,600), as do many of the Japanese automatics (and a few Russian). Some Japanese and Russian run at 21,600.
Do correct me if I'm wrong on these anyone...:confused1: