38mmJunghans Cal. J800.1 -- ETA 2824-2 base, Junghans-finished, 28,800bph, 38h PR, 25j; used in Max Bill Auto and Meister Driver; clean German Bauhaus aesthetic1961–present
40mmJunghans Cal. J880.1 -- ETA Valjoux 7750 base, Junghans-finished, 28,800bph, 42h PR, 25j; used in Max Bill Chronoscope; Bauhaus design with flyback chronograph1962–present
36mmUniversal Geneve Cal. UG 66 -- manual-wind, 18,000bph, 44h PR, 17j; thin dress caliber used in the classic Genève line; no complications, single-barrel manual movement1960–1985