HERE IS A ALL ORIGINAL ANTIQUE JAS. P. MARSH STEAM FURNACE GAUGE MADE FOR HENION & HUBBELL STEAM BOILER FURNACE CO. THE GAUGE IS IN VERY NICE CONDITION, POLISHED BRASS BEZEL WITH VERY NICE ORIGINAL GLASS AS WELL. IT DOES SHOW THE COMMON SURFACE RUST ON THE BACK AS SEEN IN PHOTOS. THIS GAUGE IS UN-TESTED. THE FACE OF THE DIAL MEASURES 4-3/4" DIAMETER. THE HEIGHT INCLUDING VALVE IS 7-1/2". ANY QUESTIONS PLEASE ASK. THANK YOU.