Usually when there is that single line across a stamp, it comes from a sample, publication, booklet cover, advertisement, etc. The line serves to invalidate the image from being used for postage.

There are scissors available that make cuts like that. There is some evidence that may point to it having been cut with scissors. On the right vertical side, the cut is wider at the bottom than at the top.

I can't see if the bottom and left sides are imperf. From the three booklets that I have with this stamp, the stamp is imperf on the top and left, top and right, or right only, or left only.

The stamp was released in sheet format, souvenir sheet, and a few different booklets. I have never seen it as a self-adhesive, which was not common in 1970. My guess would be that it came from an advertisement for the fair, or an advertisement for the stamps issued for it.

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