"Test-O-Skill" - Arcade Token

This is a circa 1960's arcade token marked "Property of Test-O-Skill, Inc. Chicago. Made out of brass and only 3/4" in diameter. It simply features a "1" on the reverse. - Unable to find any history of this company or token but it pre-dates video games so I assume it is an arcade token, possibly for use in a pinball machine or carnival game.