This studio model was one of the concept models designed by Nilo Rodis-Jamero and built at ILM by model builders Bill George and Steve Gawley for the USS Excelsior for Star Trek III: The Search for Spock.
For further information on this studio model, see: Excelsior-class study models.
During the early 1960s, Richard C. Datin, Jr. built models for some of Alka-Seltzer's television commercials; Datin went on to become the very first Star Trek studio model maker in 1964. (The Enterprise NCC 1701 and The Model Maker, pp. 21-22)