Starrett Inside Vintage Calipers with Micro Adjust.  These vintage calipers are stamped with ' The L.S. Starrett Co. Athol, Mass. USA Made in USA' on the micro-adjust leg. They are made from steel which has some light pitting.  This pair of vintage calipers is fully functional and in good shape except for previous surface rust.  Total length is 8 ½ inches and weighs 0.4 lbs