Dan Vincent and I recently visited the New England Air Museum in CT. They have the preserved cockpit (just the cockpit!) of Pan Am's N714PA (Clipper Golden Eagle).
Photo © Dan Vincent - New England Airports
Photo © Tony Printezis
Note that the instruments for engine number 1 are different to the rest (and there's a clear separator between them and the rest). Does anyone know why? Was it maybe used an an engine test bed? Just curious...