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Is that sheet laminated?
I don't think it's laminated, but it does have a plastic "coating" over it that may be removed. It would seem the seller is not a stamp collector, but the seller's description reads as follows:
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Sheets have been plastic coated for preservation
Plastic covering may be removed for use of stamps
The reason I brought this up in the first place is that I don't recall seeing too many "gutter" blocks of stamps from the mid-1960s so I don't think the 200 subject "sheet" was commonly available at that time, as my assumption was that they would have been cut into panes of 50 before being shipped to post offices for retail sales.