Attention please: See the Scanned Images and read the full description:
1939 Nybro issue I.
This envelop is classified as M3d (greenish light blue).
Line perforation type IV, see attached print and reference picture of type IV.
Variant ÖK (open crowns), see image
The envelop is complete including the Replay Stamp.
All my classifications of Swedish Military items are done according to the FACIT Special Classic 2022 stamps catalog. That includes color nuances (a, b, c...) and types of paper, printing, types/variances (v1, v2, v3...)
The specialized classification is done by using the descriptions on the book " Svensk Frimärksfakta 15:1, Militärbrev med Svarsmärke”, issued by the Swedish Philatelic Association (SFF). That includes types of Perforation, as in the M 3 type, cliché types, plate variances like the M 7, M 8 type, etc.
Other special classification according to the available articles written by Mr. Harry Salomon Hohndorf, leader member of the Military Postal Association Board and other experts, published in the following magazines; MPT (Militär Postal Tidsskrift), SFT (Svensk Filatelistisk Tidskrift), PR (Postrytaren) and NF (Nordisk Filateli).