As Glenn-san wrote previously, it's more likely a supplement/free extra that came with a magazine 冨士新年号(Fuji New Year Edition), which was published by 大日本雄弁会講談社[Dainippon Yuubenkai Kodansha] on 1st January, 1939. The Fuji was first published on 1st January, 1928 as the renamed version of a magazine 面白倶楽部[Omoshiro Club], and was unified with a magazine キング[King] on 1943.