| Brand | S. Epson (Seiko) |
| Caliber Number | YN84, YN84A |
| Movement Type | Automatic, self-winding mechanical |
| Diameter | 27.4mm |
| Height | 5.32mm |
| Jewel Count | 22 |
| Beat Rate / Frequency | 21,600 bph / 3 Hz |
| Lift Angle | 52 degrees (unconfirmed) |
| Power Reserve | 40 hours |
| Hand-Windable? | Yes |
| Anti-Shock Device | Diashock |
| Hand Count | 5 |
| Functions | Central hours; central minutes; central sweeping seconds; fan style power reserve indicator at 12:00; 24 hour indicator at 6:00; open balance wheel at 9:00 |
| Hacking Seconds? | Yes |
| Country of Manufacture | Made in Japan |
| Known Models | Vostok Europe Expedition (Ref: YN84-597A543), Master Works Quattro / 001 (Ref: MW08SI1-GCBKG81) (Add your watch to the comments below…) |
The S. Epson caliber YN84 is an automatic movement with a power reserve indicator and a 24 hour subdial.
The YN84 is also capable of displaying an open balance wheel at 9:00, although not all watches powered by this movement will have the cutout for it.
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