Tempo
Tempo appears to be an early Chronotechna-family chess clock, although the exact model chronology remains unclear.
The Radio-Shaped Clock
The molded Bakelite radio-shaped Chronotechna is visually much more modern than the usual rectangular wooden tournament clock. Its three-button arrangement and compact consumer-product case give it a distinct identity.
Object-Based Reconstruction
The surviving evidence is stronger at the object level than in factory catalogs, so the sequence between these designs should remain cautious.
Historical Significance
Together, Tempo and the radio-shaped clock demonstrate that Chronotechna was a platform for multiple chess-timing designs rather than a single model.