Columbia [Standard model]

1. Columbia [Standard model] (1936)
1. Columbia [Mystery Play model] (1937)
1. Columbia [Mint Vender model] (1937)
1. Columbia [Gold Award] [Fruit Reel] (1937)
1. Columbia [Gold Award] [Cigarette Reel] (1937)
2. Columbia [Check Separator Bell] (1938)
2. Columbia [Check Separator Bell] [Side Vender] (1938)
3. Columbia Jackpot (1940)
4. Columbia [Club Bell] (1940)
4. Columbia [Club Bell] [Gold Award] (1941)
5. Columbia [Club Chrome Bell] (1941)
5. Columbia [Club Chrome Bell] [Handload model] (1941)
6. Columbia [Club Deluxe Bell] (1946)
6. Columbia [Deluxe Bell] (1947)
7. Columbia Twin Jackpot (1946)
8. Columbia Eagle (1948)

Collector's Treasury of Antique Slot Machines from Contemporary Advertising - Peter Bach - Page 167
Collector's Guide to Vintage Coin Machines - Richard M. Bueschel - Page 49
The Coin Machine Journal - January 1940 issue
Loose Change Blue Book for Slot Machines [4th Edition]