The Miyota caliber 8217 is from the 8215/821A family.
Aside from the hours/minutes/central seconds and date, this movement has a 24 hour subdial at 9:00.
Miyota claims that the caliber 8217 offers accuracy of -20 ~ +40 seconds per day.
Another movement that is similar is the Citizen caliber 4166.
Here is the 26mm Miyota 8217 movement in a 46mm Szanto Big Aviator watch:
The photo below is of a Miyota caliber 8217 found in this AVI-8 Hawker Hunter watch here.
Do you have a watch powered by the Miyota caliber 8217? Let us know your experience in the comments below…