The Senta National Liberation Committee's "Book of Postal Items" proves that the rubber provisional postmark was used in Senta in late 1944 and early 1945.
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1944 Senta National Liberation Committee's "Book of Postal Items"
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A page from the book showing the rubber provisional cancellations.
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1944 Senta provisional issue, letter, properly franked with 30 f, sent from Senta (2.I.1945) to Mol, cancelled with rubber provisional canceller "ПОШТА / __ ★ 194 / СЕНТА" (= "POST OFFICE / __ ★ 194 / SENTA"). Latest known use of the Senta issue. Only two Senta letters with this cancellation are known.