Welcome to the cinderella pages!
 
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"Nansen stamp" issued by UN between the wars    
If your "mystery stamp" has a king or coat of arms on it it is most likely a revenue.
If it has a queen on it it is most likely a "Timbre de Ajutor" - Social assistence stamps.
If it carries the inscription POSTA ROMANA and it is not listed in catalogues -
check the listing for Madrid "Exile Governement" cinderellas. (Some Brasilian variations exists).

If none of the above, and none of the possibilities to the left, well, then I recommend
Ing Mihai Cojocar`s  "CATALOGUL TIMBRELOR FISCALE ROMANESTI" or
John Barefoot & Valentin Robuīs "BULGARIA & ROMANIA REVENUES"
All entries in "Unlisted" are cinderellas not listed in Mr Cojocarīs catalogue

If none of the above and not in the catalogue - send me a jpg!    mats