Found on ebay: Spacecraft Concept Contractor Desk Model – NASA/USAF

USAF SPUR SPACECRAFT CONCEPT MODEL

This is a Space Power Unit Reactor Concept Desk Model. This model was made by the Garrett Corporation in the early 1960’s. This proposal model and booklet was used by Aerojet, Westinghouse, and AiResearch to show NASA their idea of the SPUR electrical power/propulsion supply. The model measures 3” wide and 6 ½” long. The entire model is metal and the stand is lucite. Both the model and booklet are in great condition. Concept models were made in very small numbers, so don’t miss out in this early space race model that unfortunately was never produced.