A Moore Drop Forge version. Mid 40's to mid 60's, when Sears started offering the more familiar baby rattle selector. (Cheaper to make) No rebuild kits available, but a solid tool if it's in good shape. Clean, inspect, and lube - then use it.
Sometimes called a Tombstone. I have a few of them in the various drive sizes, but the most special one I have I found cleaning out my wife’s grandpas shop before the auction. A complete 1/4” kit circa 1950 or so.