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The "Model 5" was the prototype for the first RCA production color set, the CT-100. The Model 5 circuitry is virtually identical to the later CT-100, with a few different tube types. The Model 5 cabinet is similar to the CT-100, but the speaker grill is different. Only four of the original Model 5 color receivers are known to survive. For more information on the history of RCA and color TV, see Ed Reitan's site.