Early rare 75 psi US GAUGE for a wood dash. Bevel glass is excellent no chips! I don't have batteries for my digital micrometer. It looks like it's about 2-1/6 or 2-1/8 size threads.The lip on the front bezel on the back is bigger. Measuring across the front bezel with a tape measure total width is 2-1/2 or 2-9/16. The art and needle is gold or brass color, never white. The nickel bezel has a little bit of wear and patina, a couple of nicks I did not clean or polish. Please view all the detail pictures! Great addition to your barn find build!