| Manufacturer | Seiko |
| Caliber Number | 6F22, 6F22A |
| Movement Type | Quartz, battery-powered |
| Production Span | circa 1980s~1990 |
| Diameter | 19mm x 22mm |
| Casing Diameter | 24mm |
| Height | 3.3mm |
| Jewel Count | 1 |
| Frequency | 32,768 Hz |
| Battery Cell | SR920SW (371) |
| Battery Life | ~3 years |
| Regulator? | None |
| Driving System | Step motor |
| Hand Count | 3 |
| Functions | Central hours; central minutes; central seconds; moonphase indicator at 6:00; date at 12:00 or 3:00 |
| Hacking Seconds? | Yes |
| Quickset Date? | Yes |
| Country of Manufacture | Made in Japan |
| Known Models | (Add your watch to the comments below…) |
The Seiko caliber 6F22 (6F22A) is a vintage quartz moonphase movement with a date.
Seiko 6F22 VS 6F29:
There is a similar caliber 6F29 with the main difference being that the 6F22 is a 3-hander (hours/mins/secs) and the 6F29 is a 2-hander (hours/mins).
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