I suspect it is probably WW2 or between WW2 & the Korean War. At that time Athearn was offering their all metal kits. I'm not sure the exact date, but sometime in the early 1950's Athearn went to molded plastic for their kits. A few wooden kits hung on for a while afterward, but generally not with printed paper sides. I suspect it might have been made during the war when metals were rationed. There are collectors of those old kits, most are collected unbuilt in original boxes.