Ottoman dated postmarks types with date belt 1908-1918
s
Bilingual Circular & Octagonal
s
Arabic
Circular & Octagonal
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Various
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Date formats
References:
Osmanlı Postaları damgaları- Dr.H.Y.Nuhoğlu-T.Mert 1990
Postal cancellations of the Ottoman Empire - John H.Coles & Howard E. Walker