Grand Seiko 6155-8000 and 6156-8010

No historical Grand Seiko series utilizes more movements than the 61GS. No fewer than 7 different movements were used over the 6 or so years that this series were on sale.
Seen here are the “Specials”. On the left the 6155-8000, and on the right, the 6156-8010. Both of these watches are from 1970. The difference between the two movements is clear from the photo but in addition, this particular variation of the 6156 has a 3-faceted cut glass crystal.
These truly are beautiful watches. The cases in particular are so crisp.
What makes the “Special” special, is that the movements were regulated to an even greater degree of precision than the regular Grand Seiko standard. The “daily rate” was regulated to -3 > +3 seconds per day, whereas the regular Grand Seiko standard was -3 > +5. Astonishingly, these watches were actually rated to be more accurate than the modern 9S calibers.
There were some more finely adjusted Grand Seikos that were regulated to an even greater level of precision than that, and I’ll share images of one of those watches at the weekend. (Surprisingly, these Specials are not so hard to track down. Earlier this month, no fewer than 4 different dealers in Japan all had the 6156-8010 available, although it must be said that none of them were in as great condition as this sample. So if you’re after one, be patient and wait for a good one – you don’t have to panic-buy the first one that comes up for sale!)


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