Three types of vintage Japan National Railways horizontal envelopes. (Large: 12, Medium: 20, Small: 30) - Unique sizes and designs, not standard envelopes, specially made for JNR. - Marked with "Paper xx," the management number for paper used by government offices, schools, and public corporations in the 1960s and 1970s. - Marked with the names of suppliers such as "Kohshundo," which was used by government offices. - Marked with dates such as "(53.5. Kohshundo)" indicating May 1978. ● Paper 47 (54.5 Kohshundo) 12 sheets Approx. 267mm x 190mm ● Paper 48 (54.5 Toyokan) 20 sheets Approx. 270mm x 125mm ● Paper 49 (53.5 Kohshundo) 30 sheets Approx. 190mm x 125mm Slightly larger than the current Western-style No. 2 envelope (162 x 114), large enough to fit foreign postcards. Perhaps unusual for the time. - Some yellowing of the paper due to aging. There are also some folds and stains.