Hi, this is a 1909 Romanian stamp showing King Carol later overprinted for use as a regular stamp in 1919 with the monogram of King Frederik who had become king in 1914.
The Debrecen stamps that kuhli mentioned have a similar overprint on Hungarian stamps. That overprint isn't the same but it also includes King Frederik's monogram.
Thanks for the info. I recently posted this stamp on ebay but since i'm new at this I hadn't posted much information along with the stamp. This should help!
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