Monitoring and supervising receiver of the SVITAVA army local pager system. In that system, the encoder delivers two-tone sequential combination (any two tones out of 7 possible), thus giving 42 variations of selective page address. This receiver is equipped with 7 tone detectors to monitor the correct encoding and transmission of the page signal. The receiver's frequency was fixed one out of the pager's RF range (about 2MHz).
This given receiver is sligtly specific - the operating frequency isn't usual for SVITAVA (see above), as used in Czech Army, but for a longwave 290,5 kHz. I do not have any information about usage of that frequency band and I did never seen even a paging receivers for that LW band.
The receiver is fully operable, A+ grade. No documentation so far.