BuckaCover.com - 80,000 covers priced 60c to $1.50 - Easy browsing 300 categories 26 Mar 2021 04:10:48pm
re: Nicaragua puzzle.
That's because it is not a stamp, it is a cut square from a postal stationery envelope. Scott lists those only for the US and territories and only in the US Specialized catalogue.
Roy
  3 Members like this post. Login to Like.
"BuckaCover.com - 80,000 covers priced 60c to $1.50- 10,000+ new covers coming Tuesday June 1"
Could be a letter sheet. The stamp was printed on a piece of paper that was folded over. It went at a lower UPU rate, like aerograms. The US had a letter sheet it has President Grant on it.