I have two quarter sheets (64-ish cards on each) from 1973, both sheets were of low numbered cards. The assumptions about equal production figures are probably correct, but might be off slightly for cards that were updated. Topps did not always keep cards that were updated on the same sheet.
Topps started labelling their sheets with letters (generally A - F on the reverse) some time around 1977 and placed the * or ** (noting card was updated) adjacent to the letters. One of the sheets I have (not from 1973) is an “updated” half sheet and was miscut. The edge of the sheet was printed with another half sheet from a set that had a continuous black border from a different set or year.
Very odd…..
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