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ID plate. It is faded but it appears to read (most of the digit "1"s appear to be replaced with letter "I"; this is actually F-1 engine F-107-1):

Part Name: Engine Assy. (Test Only)
Contract No: 088710
Part No: I0400I
Serial No: I07-I
Model No: F-I

Time picture taken	Thu Jul 31 15:15:18 2008
Location picture taken	Open-Air Exhibit Gallery Science Museum Oklahoma (formerly the Omniplex) Oklahoma City, OK