Help with Gold Plated Part Identification

I was an avionics tech in the Marines for 20 years. There was a rumor that one or more of the flight reference gyros contained a substantial amount of gold. Some ot the gyros that we used looked a little like a black metal box shaped like a loaf of bread. Some were a square box frame with a cylinder shaped metal "can" inside the frame. Keep an eye out for any metal boxes like in the photo above. The military used the very best in materials. Mike.