I looked at my 1973 set this evening and noticed that 5 of the blue checklists were on darker stock than the others. Upon further inspection, all 5 of those had the notation that they were printed in Canada. I'm assuming that they are the OPC versions which, at least in later years, were on lighter stock.
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Working Sets:
Baseball-
T206 SLers - Virginia League (-1)
1952 Topps - low numbers (-1)
1953 Topps (-54)
1954 Bowman (-2)
1964 Topps Giants auto'd (-2)
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