So i pick an estate ..this guy had a large machine shop and worked on airplanes in the 30s and 40s..i have the inner working of what i think is a radar unit.... has over a pound of what looks like 22K gold..not selling that..this gage comes from an airplane of that period..... needle still floats so im sure it works...but no guaranty's..its 3" across..will ship well packed and insured