APS Engine Mockup

In the lobby of the "old" museum building (where the ticketing counters and gift shops were located) are two lunar module engine mockups, an Ascent Propulsion System (APS) engine mockup and a Descent Propulsion System (DPS) engine mockup. Both are constructed of what appears to be sheet metal and seem hollow (perhaps double-walled?).

Although the APS mockup is displayed without a valve package or propellant lines, its general shape and proportions are fairly close to the flight engine model.

Based on information on the ID plate, the mockup's design reflects a specification number of "LSP-270-5A", which dates back to 29 June 1963.