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The folding Comet camera from United States Camera Co. is dated in McKeown to circa 1956, and described as similar to the Pho-Tak Foldex 6.3—itself nearly identical to the USC Rollex 20. The Comet variant does not appear to be as commonly seen.
- McKeown, James M. and Joan C. McKeown's Price Guide to Antique and Classic Cameras, 12th Edition, 2005-2006. USA, Centennial Photo Service, 2004. ISBN 0-931838-40-1 (hardcover). ISBN 0-931838-41-X (softcover). Page 936.