up for auction from an estate we have an old radio tube - diode & battery tester - Made and marked Supreme Instrument Corp. - Greenwood, Miss. - Model 599-A - We plugged it up and the meter guage does work but we did not test anything as we are not collectors and do not have diodes or tubes available - All the black knobs & tube holders appear to be made of bakeolite - The black electric cord is good and has the old sealed plug - The tube tester cable is t w/the blk. knob - The holding case appears to be made of wood covered with some kind of leather or vinyl - The case after all these years does have some wear but is still decently covered - Case measures 11" wide x 5-1/4" tall x 9" deep - The old leather carrying handle is still t and in decent cond. - Overall a nice old radio tube - battery & diode tester found at an estate and is in "as is - found" collectible condition - Will be shipped to you by large flat rate box - priority mail to save you on actual shipping costs -