MADE BETWEEN 1939 AND 1940 PRE WAR WITH SMOOTH WHEELS AND .062" THICK AXLES AND GREEN BASE PLATE. IN SETS AND TRADE BOXES. RE RELEASED POST WAR 1947-1954 WITH .078" THICK AXLES, EARLY GREEN BASE LATER BLACK. SOLD IN TRADE BOXES ONLY AND AS A SET OF THREE IN TRADE BOXES OF THREE SETS.