Please see the scan which shows this stamp without the star on the wing. Everything else appears normal and it does not look over-inked. Sanabria makes no mention and the same for Scott's. I collect world air mails but know nothing about Bulgaria. Any help would be greatly appreciated.
I also am w world airmail collector. Feel free to contact me with anything concerning this area. I assume this is the overprint that you are referring to.
Is it the upper wing or lower wing that is missing the star? A larger scan would be helpful.
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