antique copper probe thermometer, working industrial test equpiment

Early 1900s vintage probe thermometer made by US Gauge, marked with their emblem on the face. We've tested this, and it works, although the face is worn and stained, without a glass cover plate. The probe and the interior of the case looks good, but the outside of the case has soil and worn paint. Measures 4 1/4" x 3 1/2".