This a very clean, used, firm-joint hermaphrodite caliper that is marked "UNION TOOL CO. ORANGE MASS. U.S.A.". It measures 4" long from the center line of the pivot joint to the tips. It is in very good working order, good clean threaded rod, and good sharp adjustable scriber point and holding hardware, very good pivot joint. There is no rust, no pitting, no damage. We note that the caliper tip has some minor wear noted, but useable. This shouldn't effect use in most applications. A quality made tool, by a rather rare quality toolmaker!