The Vintage Wings website has a
page on the differences between a C-47 and a C-53.
The type certificate for the DC-3,
A-669, lists the following models/variants:
Federal Aviation Administration wrote:
- DC3A-SCG
- DC3A-SC3G
- DC3A-S1CG
- DC3A-S1C3G (Army C-41, C-41A, C-48, C-48A, C-52, C-52A, C-52B, C-52C, C-53, C-53B, C-53C, C-53D, C-68; Navy R4D-3, R4D-4)
- DC3A-S4C4G
- DC3C-SC3G
- DC3C-S1C3G, -S4C4G (Army C-47, C-47A; Navy R4D-1, R4D-5)
- DC3C-R-1830-90C (Army C-47B, Navy R4D-6)
- DC3D-R-1830-90C (Army C-117A)
Finally, ̶w̶h̶i̶l̶e̶ ̶I̶ ̶u̶n̶f̶o̶r̶t̶u̶n̶a̶t̶e̶l̶y̶ ̶d̶o̶n̶'̶t̶ ̶k̶n̶o̶w̶ ̶w̶h̶e̶r̶e̶ ̶i̶t̶ ̶c̶a̶m̶e̶ ̶f̶r̶o̶m̶ ̶a̶s̶ ̶i̶t̶ ̶w̶a̶s̶ ̶j̶u̶s̶t̶ ̶a̶ ̶c̶l̶i̶p̶p̶i̶n̶g̶ ̶w̶h̶e̶n̶ ̶I̶ ̶f̶o̶u̶n̶d̶ ̶i̶t̶, a family tree titled "Douglas Commercial-3" was published as a sidebar to an article in some periodical likely during the 1940s or 50s:
Attachment:
Douglas Commercial-3.png [ 765.07 KiB | Viewed 1320 times ]
(Source: Paul H. Howe and Louis Banks, “Queen of the Transports,”
Flying, April 1946,
28.)
EDIT (22-09-02): Found the source of the article.
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Warbird Philosophy Webmaster