I've found an old photograph that my Grandfather took of what I believe
to be a Lockheed Electra, registration number NX 51800.

The photo is probably from the late 30's or early 40's and has about 6
men standing in front of the plane.

Is there any chance of finding out anything about that plane from it's
registration number?

Google, Dogpile and the FAA were no help.

Thanks,

Jeff DeWitt