iT'S A 30 SERIES,ONLY 30 SERIES HAVE ASYMERICAL BELTS....CORRECT 20(STAMP) MEANS NOTHING....IT REFERS TO 20*/NOT 20 SERIES....i CAN SEE A GREEN SPRING IN THE DRIVEN,ANOTHER INDACATION, BUT WITH BOTH DRIVER/DRIVEN BACK PLATES(PULLY) FLAT LOOKING(ACTUALLY 2*) AND THE OUSIDE PLATE(PULLY) ABOUT 18* SHOULB BE A 30 SERIES COMET TAV.