ZB4BW7A1721 - Illuminated double headed push button head, Harmony XB4, metal, 22mm, 1 white flush marked I + 1 pilot light + 1 black flush marked O

ZB4BW7A1721 - Illuminated double headed push button head, Harmony XB4, metal, 22mm, 1 white flush marked I + 1 pilot light + 1 black flush marked O