S. Epson Caliber YN56

The S. Epson caliber YN56 (YN56A) is essentially an unbranded version of the Orient caliber F6922. It is a self-winding automatic movement with 22 jewels, also featuring hacking and hand-winding functionality. These movements are manufactured in Japan.

YN56, YN56A, YN56B, YN56C, etc…

The letter at the end of YN56 indicated the iteration of the movement. YN56 is the base caliber number and YN56A is the first version. As of this post, there is only a YN56A iteration, therefore, YN56 is the same as YN56A.

Accuracy:

Accuracy of the calibre YN56A is said to be within -25 seconds to +35 seconds per day. These ratings are based on the watch being at room temperature with the mainspring fully wound and the dial up position. Official documentation from Orient suggests that deviations from the accuracy claims should not be regarded within one day but within a one week period of results.

From the Orient manual:

“In order to maintain the watch’s accuracy, we recommend wearing the watch at least 8 hours a day.”

Power Reserve:

The YN56A has a power reserve of 40 or more hours. Winding the crown 30 times will wind the spring fully and achieve full power reserve.

Setting the Celendar:

To set the date on your S. Epson YN56 powered timepiece, pull the crown out one click to calendar setting position. Turn the crown counterclockwise to advance the date. Avoid setting the date between the hours of 8:00pm to 4:00am. Turn in the other direction to set the day of the week.

Additional Resources:

• Orient caliber F6922
• Orient Mako II user manual
• More Seiko movements