The tuning fork watch of the Japan-Electric-Clock Co. of Tokyo, Japan (Jeco Co.Ltd). (Patent 33.310, 38.338, 38.339 and 59.331 Japan 1963). The Jeco has a curious magnetic escapement and must be started by hand. It is unknown whether commercial production ever took place. Jeco also manufactured tuning fork clocks by themselves under licence of Bulova.