| Brand: | Seiko, Seiko Instruments Inc. | 
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| Family: | |||
| Height: | mm | ||
| Jewels: | 29 | ||
| Reserve: | 45 hours | ||
| Frequency: | 28800 A/h | ||
| Winding: | Automatic, Bi-Directional Automatic Winding | ||
| Diameter: | 27.40 mm (12 ligne) | ||
| Complications: | Date, Date by Pointer, Power Reserve Indicator, Quick Date Correction | ||
| Hands: | Central Hour Hand, Central Minute Hand, Date Pointer at 6:00, Power Reserve Pointer at 9:00 | ||
| Production: 2013 – 2013 | |||||||||||
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| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Seiko Cal. 6R27 is a midrange automatic movement produced by Seiko Instruments Inc. (SII) for Seiko watches. Like other Seiko 6R movements, it is more refined and accurate than the related Seiko 4R series and uses a Spron 510 mainspring. Unlike Cal. 6R15, it is a “Hi-Beat” movement operating at 28,800 A/h and has complications: Date subdial at 6:00 and retrograde power reserve at 9:00. Cal. 6R27 lacks the central seconds hand of all other 6R movements.
Cal. 6R27 was only used in the 100th anniversary Laurel tribute model, SARW005 in 2013.
According to Seiko documents, this is a modular movement based on Cal. 6R15 but with a Hi-Beat balance.
| Jewels | Components | Speed | 3:00 | 6:00 | 9:00 | |
| 6R15 | 23 | 168 | 21,600 | Date Window | ||
| 6R20 | 29 | 208 | 28,800 | Day Subdial | Date Subdial | Clockwise Power Reserve |
| 6R21 | 29 | 208 | 28,800 | Day Subdial | Date Subdial | Counter-Clockwise Power Reserve |
| 6R24 | 31 | 224 | 28,800 | Retrograde Day | Retrograde Date | Clockwise Power Reserve |
| 6R27 | 28,800 | Date Subdial | Counter-Clockwise Power Reserve |
