Technos “Mosaba”

European Watch Clock and Jewellery Fair 1990 BF 301
Technos is marketing a limited series of “hummingbird watches”, a.k.a. sonic-resonator, or tuning-fork, watches, fitted with the famed Masaba movement whose 300-Hertz vibrations produce a slight humming sound. Probably the last such timepieces available today, these watches are styled in steel and goldplate and represent a must item for shrewd collectors everywhere. (TECHNOS “Mosaba”)