Since they were the first lifestyle pair, I wouldn't think they'd be limited, aside from perhaps limited production capacity due to a relative young company. Gen 1's went from 1985-1989, and the Gen 2's from 1990-1996 when the 'New' Frogskin came out. Production numbers would be anyone's guess, and due to the age, you'd probably need some sort of internal tax document to prove it, which we'll never see.