:thinking:
Where has it been "proven"
It's been proven by the thousands of A6497 PAM reps that have been purchased and running flawlessly for years without issue or servicing.
Not to mention all of the non-rep watches that use the A6497, as well.
Take a look here:
http://forums.watchuseek.com/forumdisplay.php?f=72 for more information about (non-rep) Chinese watches and movements.