The cards in this 161-card set measure approximately 2 1/2" by 3 1/8". Gum Incorporated introduced a brief (war-shortened) but innovative era of baseball card production with its set of 1939. The combination of actual player photos (black and white), large card size, and extensive biography proved extremely popular. Player names are found either entirely capitalized or with initial caps only, and a "sample card" overprint is not uncommon. The "sample card" overprint variations are valued at double the prices below. Card number 126 was never issued, and cards 116-162 were produced in lesser quantities than cards 1-115. A card of Ted Williams in his rookie season as well as an early card of Joe DiMaggio are the key cards in the set.