The Miyota caliber 8218 is an automatic movement found in many microbrand watches.
Miyota 8218 vs 8245
The caliber 8218 has a date at 3:00. The caliber 8245 is the same as the 8218 but without a date complication.
Miyota 8218 vs 8219
Similar to the caliber 8218, there is also a caliber 8219. They are essentially the same with exception to a 24 hour hand on the 2819 at 9:00.
Miyota states that the caliber 8218 keep accuracy within -20～+40 seconds/day, with a posture difference of under 50 seconds/day.
The power reserve or running time when fully wound is about 42 hours. As for getting the full power reserve, Miyota says: The mainspring becomes fully wound by rotating the ratchet wheel 7.5 times or turning the crown 40 times.
The example pictured below is from the crowdfunded SD-09 UFO Spacecraft watch. Please talk about your experience with the Miyota caliber 8218 in the comments below.