that the Service Manual does not show the 400, mine does not either . It does show the Ladies 17 jewel series through 1967. Also, in Timex,(the book) it says "In 1959, U.S. Time cased this Hattori movement (the 17 jewel movement)and offered a seventeen jewel watch, called the Timex 400,...". I'm not sure what they were doing in 1958. I also do not know if they stopped production of the 400(Hattori) after only two years 1959 and 1960 so as to exclude 1961 as a possibility. This was the same time period Timex was developing their own jeweled movements.