"...This company was in the city of Kharkov, which is nowadays in Ukraine. It was called XB3, Cyrillic for KhVZ, Kharkivsky Velosipedny Zavod, Kharkiv Bicycle Factory. XB3 did produce several qualities and "brands". For the regular or entry level racers, there were "Record" bikes, while the most exclusive products for the world class riders were the well known "Takhion. XB3 bikes can be placed in this sequence: Rekord, Sprint/Meteor, Sport, Kvant, Takhion, Moskva 80...." from http://progettopistavintage.blogspot.com/2011/01/xb3-track-bike.html