This seems to be a perforation error(?). The 2 double stamps (not separated) have the same perf mistake as the 2 single stamps. Is these any value to these?
Yes, it is considered an error. There is also some value to these although I could not tell you ho much. You could check ebay and go to EFO's to see similar die cut errors.
EFO = an acronym for error, freak, oddity. I visualize this on a scale of 1-10, let's say: 10 - error 9 8 7 6 5 - freak 4 3 2 1 - oddity Each collector gives a mental score to any EFO item with price/value increasing accordingly up the scale. There are no set definitions, as you can see from the responses you have received so far. Some have called your stamps an error and some have not. I would rate a minor perforation shift such as your at about a 2.5
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