Original vintage 1970s Seiko advertisement for their atypical Bell Matic alarm watches - "The watch heard round the world...Seiko Bell Matic"
 
Dimensions: 10 inches wide by 13 inches high
 
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.