I Hope This Helps.....
Hey Sust-Man,
I am currently taking the clear amps of primo and getting great results. The rubbing off print is pretty scary, actually I have NEVER seen print rub-off of a primo amp. My amps are in light green writing and has the Serial No. 01064, Imal Ta.: 01.00, Son Kull Ta.: 01.2005...........I hope this is of some assistance. But, the bottom line is that your print should not be rubbing off.
The Answer