Up for sale is this The Ashton Valve Co. pressure gauge produced in Boston Mass. There is no roung glass piece. For well over 100 years it’s in very good condition. There is still spring tension on the arrow/needle. No major rust anywhere on the iron. The numbers at the bottom of the gauge is: 261 298. The diameter of the front (end of brass ring to end of brass ring) is 4 in. The diameter of the iron base is 4 5/8 in. The whole unit weigths 1 lb., 14 oz.