One of the first "true HAMradio" products of the Czech Radioclub's Cetral Radio Manufactory (ÚRD - Ústřední radiodílny). This is a VFO/XO mixed exciter (or QRPP transmitter), delivering about 10mW RF power. CW only. At this piece is a crystal oscillator board missing. No more information, no documentation. Production date about the midlle of seventies.