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I am interested in peoples explanations of why they believe that this stamp is real or not.
The stamp is a trimmed Scott 375 sheet stamp. The top and bottom margins uneven and much too narrow. The perforations look genuine. Most used 388 fakes are trimmed sheet stamps while most unused examples are 384H imperf coils with fake perforations added. Genuine 388 examples, the few that exist, are a duller shade than fakes contrived from later printings.