Monte- a rising tide lifts all boats. I think '60's packs have been drying up for some time. In '04 or so you could go to Steve Harts site and put together a full run '51 on up, minus '56 and '58, in one shot. I doubt you could put together that run now in 3 years, even paying whatever it takes. It's tough even finding '60's packs now, let alone most '50's packs.
FWIW the toughest pack (regular nickel pack) of the '60's was '61 for me.
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