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Brand: | Seiko | 
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|---|---|---|---|
| Family: | |||
| Height: | 3.69 mm | ||
| Jewels: | 26 | ||
| Reserve: | 45 hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Automatic, Bi-Directional Automatic Winding | ||
| Diameter: | 26.50 mm (11.5 ligne) | ||
| Complications: | Date, Hacking Seconds, Hand Winding, Quick Date Correction | ||
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Counter-Clockwise Balance Cock  Screw Regulator |
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| Production: 2018 – 2018 | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 6L35 is a high-end slim automatic movement with date from Seiko. Produced only in 2018, it part of the earlier Seiko 4L/6L family which provided the design for the Soprod A10 family of Swiss movements. It is exactly the same size as the popular ETA 2892A2, and has similar specifications as well, though the design is completely different. It is similar to Cal. 4L25 and 4L75.
This movement does differ slightly from its predecessors. It has an extra jewel, now 26, and has switched from double-cone Incabloc shock absorbers to Seiko’s own three-sided Diafix. It is also rated for 45 hours power reserve, compared to 42 hours for the previous movements.
Cal. 6L35 has only been used in a single watch model:
- 2018 Seiko Presage SARA015/SJE073J1 (Limited Edition of 1,881 examples)
- Seiko Presage SJE075, SJE077, SJE079, SJE081
Seiko 4L/6L Family History
The Seiko 4L/6L movement family is extremely rare, having only appeared in three versions in upscale and rarely-seen watches. The first member of the family, Cal. 4L25, was listed in the Seiko catalog from 2006 through late 2008 in the SARA watch line. Cal. 4L75, an upscale version, appeared in 2007 in the Credor Signo and Node lines and was retired in 2013. These differed only in accuracy (-15/+25 vs. -10/+15) and finishing. The movement returned in 2018 as Cal. 6L35, briefly used in a limited-edition Presage model, before returning to full production for Credor’s GCCD line in 2019 as Cal. 6L75.
There is no question that Seiko was working on this movement much earlier, however. It was talked about in the early 2000s, and Soprod began using the design as the basis for their Alternance 10 family in 2004. The movement continues to be produced by Soprod as Cal. M100, making it likely that far more Swiss offspring have appeared than Seiko-branded models.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.