Sweden. Military postal stationary Facit M13, Proof, complete envelope, on brown paper to test the machinery for the folding of the M13 envelopes. Printed with the first cliché. Mounted on a nice page full with knowledge. The paper used by the printer for this was usually waste paper from other printed products. Very few are known according to the handbook. A must item to be able to show the printing story of M13 issue. Excellent quality. This or similiar was sold at Philea's quality auction Nov 2010 for 7400 SEK. Very rare and an exhibition item!