Epson YN55A
Factory specs
- Caliber
- YN55A
- Made in
- Japan
- Frequency
- 21,600 bph (3 Hz)
- Power reserve
- 40 h
- Jewels
- 22
- Hacking
- Yes
- Hand winding
- Yes
- Accuracy
- —
- Diameter
- —
- Height
- —
- Functions
- Hours, Minutes, Seconds, Date
Seiko Epson's trade automatic with central hours, minutes and seconds and a date at 3 (also written YN55; the YN56 is the day-date sibling). No factory spec sheet from Epson was found. Caliber Corner gives 22 jewels, 21,600 vph, 40 or more hours of power reserve, hacking, hand winding, Diashock shock protection and Japanese manufacture, and quotes Orient USA calling it the trade version of Orient's own date caliber (it names both the F6922 and, elsewhere on the page, the day-date F6722, so no equivalent is recorded). Caliber Corner's 27.4mm diameter and 5.32mm height are identical to the Seiko NH35's and its -25 to +35 s/day accuracy is not traced to an Epson document, so all three are left blank until a spec sheet confirms them. Tier "entry", alongside the Seiko NH3x it competes with.
