Automatic Tourbillon

1. Miyota claims the caliber 8215 has an accuracy rating of -20 ~ +40 seconds per day. This is only measured within 10 to 60 minutes from a full power reserve.

To achieve full power reserve, hand-wind the crown 40 times. Power reserve or fully wound running time is about 42 hours.

2. A tourbillon is a mechanical complication found in the movements of certain high-end mechanical watches. It was invented during the era or the pocket watch and is both hypnotic and fascinating to watch. Watches with tourbillons are usually a bit expensive compared to watches without them. They are not the most common complication that you’ll find on a watch, but certainly one of the most entertaining.
3. A tourbillon is a mechanism that constantly rotates the balance wheel, balance spring and escapement while the movement is running. This is done to counter the affect of Earth’s gravity on the isochronal properties of the balance wheel and spring.
   

   Product name	Watch Movement Engraving
   Place of Origin	China
   Jewel Bearing	25
   Diameter	31mm
   Thickness	5.67mm
   Frequency	28800/H
   MOQ	2pcs
   Power Reserve	≥32H
   Functions	Transparent Main Plate,Hours, Minutes, Seconds, Skeleton, Self Winding, Three needle,Jump Hour