Double in Space

From Author Wars - https://authorwars.com/publications/double-in-space-10724.html

Overview:

Title: Double in Space
Author: Fletcher Pratt
Year: Unpublished
Publisher: Doubleday / SFBC
Binding: unknown
Type: Collection
Title Reference: Double in Space [US]
Notes: Tuck lists this as being published by the SFBC in 1953, but research has revealed that no SFBC edition exists. Perhaps Tuck confused this with the club offering of Pratt's similarly titled Double Jeopardy (SFBC, 1953)
There certainly is a later printing similar to book club editions. This has red leatherette boards titled in yellow on spine rather than the cloth covered boards. Also it does not state "First Printing" on copyright page.