The 1917 Overprint Postal Stationery features the “Marokko” spelling introduced in 1911, with the Gothic script introduced in 1905.

P18 is similar to P16 in design, with “Postkarte” to the right of the vertical line. It differs, however, in that it does not have a watermark.

P18 was only sold at philatelic offices in Berlin, and is therefore not found used.