2-6-S-45
From TIGHAR
The knob that wasn't.
Found at the Seven Site during Niku IIII. There was some speculation that it might have been a knob from the Electra, but very diligent work showed that it was a cap from something like an oil can.
The steps taken to positively identify the artifact are a model of the way in which TIGHAR resolves questions raised by its research.