Old early century architectural plumbing valve. This valve is marked Standard - Made in USA and is solid brass with chrome plating. It is about 4 1/2" high and 2 1/4" across the tap handle.
This valve looks like it is for 1/2" pipe. The female side is about 9/16" ID over the threads and the male side is 7/8" OD over the threads.
This has some wear and tarnish to the chrome.