Original vintage 1970s Seiko advertisement for their atypical Bell Matic alarm watches - "Your Portable Secretary...Seiko Bell Matic"
 
Dimensions: 7.8 inches wide by 10.9 inches high, crease in middle.
 
The Seiko Bell-Matic was produced from late 1966 to 1978, and used "4006" automatic movements with 17, 21 or 27 jewels; 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.