Sweden. Military postal stationary Facit M3 , 1939, Proofs for the cutting-lines of the reply stamp. Extra type Ix (three covers), type IIIx (three off-cover incl. one cancelled and a cover) and type IVx (cover). All on a mounted page with a lot of knowledge. The printer did some test in the beginning of the printing of the M3 issue to determine the best way to do the cutting-lines around the reply stamp. A must material in a collection to show the development of the cutting-lines. Excellent quality. Exhibition material! (8).