This stamp was issued in Mariupol in 1919 by the White general Denikin (Din-EEK-in, according to my Russian friend Marina).
The overprint may very well be fake, I don't have that book.
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South Russia Mi.#1 Mariupol 1919

Added to Ukraine #1-5, The 'Narbut... and categorized in 2 years ago

This stamp was issued in Mariupol in 1919 by the White general Denikin (Din-EEK-in, according to my Russian friend Marina).
The overprint may very well be fake, I don't have that book.