Ottoman dated postmarks types with date belt 1908-1918
   
       
    s Bilingual Circular & Octagonal    
      s Arabic  Circular & Octagonal    
    s Various    
    s 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