Thanks John. But I'm not sure I understand. My sheet is the standard size for all Topps sheets from 1957 on. There is no way that this is a half a sheet. They could not have handled a sheet with 264 cards. It would have been too wide for the presses they were using or to long and too unwieldy to handle.
So if your other info is correct (and I want to digest it a bit) then there were two sheets printed for this set.
Where's Hornish when we need him?