This is a unused 1940's vintage pushbutton switch. This is made by ARC-LES on the USA. This looks like the same type that was used for engine start on some vintage autos. The front chrome piece is 1 inch in diameter. The center round part is 0.6725 inch. This switch is normally open. I do not have the connectors that were used with this switch It is marked on side UL rating is 3 AMP at 125 volts.