Jay brings up a good point. Would Lockheed have maintained a listing of their outside parts suppliers that contributed parts used in the construction of the 10E? Obviously Pratt and Whitney supplied the engine, but who else would have provided instruments, hydraulic assemblies, etc? Even then, I would bet that Pratt and Whitney outsourced items such as carburetors and starters. My feeling is that there would have been such a list if for no other reason than to point buyers to a source for future maintenance and repair. Finding a copy of that list would allow you to track any potentially identifying part(s) back to the manufacturer. At that point documentation would be needed showing the part went to Lockheed, then back to Lockheed to search for any documentation that might show what model(s) the part was used on, and then, with luck, an exact airframe. All of this is presuming that the part(s) were serialized and that the numbers are still legible. Were items such as instruments serialized or just the larger components like engines, landing gear assemblies, etc? As Jay pointed out, I don't think this will be as simple as scanning the Lockheed microfilm. LTM, who was never very good with numbers. -John