I have newly updated my trade site to show all vintage card needs and traders. I need cards from 1951-1958, 1961-1962, and 1966-1968. I have some cards to trade from 1953 on, but the counts pick up in the 70s. Almost all of my cards are low condition, so if you're building high quality sets, I'm not your guy. But take a look if you're interested.
https://www.bcnonprofit.com/trading
https://www.bcnonprofit.com/trading
