As a teenager living in NYC back in 1973, I used to buy rack pack boxes from a toy wholesaler on the Lower East Side of Manhattan. I recall that one of the three rack pack panes would feature cards from the next series. So 1/3 of the cards in a Series Four rack pack box would be from Series 5. I just checked a May 1973 The Trader Speaks issue which had an ad from a NY dealer selling 1973 sets for $6.99 plus 95c postage, which covered the mailing for individual series as they got released!
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