Martin created this design, featuring a border of wavy lines, usually with the “Medallion” Royal Arms, for the One-inch New Popular Edition planned for publication in 1940. It became the first standard post-war cover design. The medallion’s first known appearance was in blue on the Ordnance Survey 1937 Christmas card. It was redrawn on new post-1953 covers. Most covers are on cream card. Quarter-inch and Scotland One-inch maps retain hinged covers. N.B. See No 194