My 642 finish looks horrible after several years of daily carry IWB. Does not matter to me that the finish is peeled and has dark spots cuz it's just a tool. However, my son's 442 shows only some honest holster wear - finish not peeling or discoloring at all. From these particular examples, I'd have to conclude that the 442 has the more durable finish with hard, daily usage. I AM changing next week to a 442 no lock but the reason is that the 642 has a lock. JMO, FWIW.