I'm rather endeared to the Bullova Accutron watch, which keeps time via a tuning fork mechanism (!) that drives the gear train. The watch also uses a one-transistor oscillator circuit, which qualifies it as the first 'electric watch'. As a special edition, Bullova released the 'SpaceView', with a clear face
(above image: Jeremiah O’Brien steam engine boiler detail by Nick Winterhalter) Greasy machines bare all in camera close ups! Hot gear-on-gear action! ….Knobs!