In 1966, Seiko introduced their most expensive addition to their already diverse line watch line, the Bell-Matic - like this full serviced 1970 example here, with a stunning steel-gray dial - a more expensive than Seiko’s previous models due to a newly-implemented complication – the novel and unique added mechanical alarm. 

The Seiko Bell-Matic was produced from late 1966 to 1978. They were made using "4006" automatic movements with 17, 21 or 27 jewels and while most featured the day and date there were a few models that featured the date only.  These were identified as a "4005" movement and were only manufactured before 1970.


The most outstanding feature on these watches is the mechanical watches?  The alarm of course!  The alarm is wound and set using the crown and engaged using the alarm button. In addition to these functions the crown also serves to set the time and the alarm button can quick-set the date.

INSTRUCTIONS: To use the alarm, pull the crown out to the first position and rotate counter clockwise until the red marker is pointing towards the time you want it to go off.  Press the crown in, manually wind, then pull the button at the 2 o’clock position.  When the hour hand points to the time, a little bell rings, much like an old fashioned alarm clock. 


Separately, to set the date, depress the same 2 o’clock button in (much like on the Seiko 6139 helmet) repeatedly until the correct date is reached.  Finally, to set the day, pull the crown to the second position and turn the hands to the 1 o’clock position; reverse hands counter clockwise to 9:30 pm and then turn clockwise to 1 am once again – the day will advance, repeat until desired day of the week is reached.


This Bell Matic comes with a leather strap, nylon NATO strap, springbar tool, and hard plastic travel case.

1970 Seiko Bell Matic 4006-7028 Alarm Automatic

  • DIAL: Dark steel-gray "linen" dial, which changes color based on angle and light, with no imperfections whatsoever; lume shines.  Day/date at 3 o’clock position works as designed (see atypical setting instructions above).  Matching hour, minute, and second hands.  Inner alarm setting ring rotates as designed.


    CASE: Stainless-steel case measures 39mm (w/o crown, 40.5mm with) x 43mm, with sharp case lines.


    CRYSTAL: Domed crystal is scratch and blemish-free. 


    BAND: Light brown leather rally strap, with cream-colored stitching and stainless-steel hardware.  This Bell Matic also comes with a dark blue and orange nylon ZULU strap.


    MOVEMENT: Seiko 17-jewel 4006 automatic movement, manufactured in July 1970.  Alarm functions well, as designed.  We have fully serviced this watch.


    CROWN: Unsigned stainless-steel crown.