imperforate proof in brown, on gummed paper, small sheet format, the miniature sheet was gummed and the inner part was die-cut for processing, various possible colors noted in pencil: "Red 30617/R 113291 - Blue 30613/R 113290 - Orange 7825", date "10 Mai 1944" stamped in lower sheet margin, after machining the inner part was reinserted and left ungummed, very fine, a very impressive and attractive piece documenting the manufacturing process of this issue, detailed 2012 Schweizer BPP certificate (Michel IP3)