Seiko Caliber 6R27

The Seiko caliber 6R27 is an automatic watch movement with a pointer date subdial and power reserve indicator. The 29 jewels movement is made in Japan.

Accuracy:

Seiko claims an accuracy rating of +25 – 15 seconds per day in normal temperature conditions (only if worn on the wrist in a temperature range of 5°C to 35°C).

Seiko’s statement on accuracy:

“Due to the characteristics of mechanical watches, any actual daily rate may not fall within the range of time accuracy specified above dependent on the conditions of use, such as the length of time during which the watch is worn on the wrist, temperature, arm movement, and whether the mainspring is wound up fully or not, etc.” –Source

Similar Calibers:

The caliber 6R27 is similar to the 6R20, 6R24, and 6R21,and even shares the same instruction manual.

What are the differences?

All 4 variations have the power reserve indicator at 9:00 and a date subdial at 6:00. The difference is that the 6R20 and 6R21 have a day of the week subdial at 3:00. The 6R24 has a retrograde day of the week indicator at 3:00 (as well as a retrograde date indicator at 6:00. Which also explains why the 6R24 has 31 jewels instead of 29). The 6R27 shown here only has the power reserve indicator and date subdial.

How about the base movement?

It is based off of the caliber 6R15.

From Monochrome Watches about the base caliber 6R15:

To say that the 6R15 is Seiko’s answer to the Swiss workhorse that is the ETA 2824 would be an understatement. Bottom line is that the 6R15 caliber is that GOOD a movement and with the sheer number of ETA-powered watches out there, it is sometimes nice to have something different to stir up the masses.

Fratello Watches says this about the 6R27:

It is not as refined as their Grand Seiko movements of course, but certainly can hold up to some of its Swiss competitors, especially in the same price range.

Watches with this caliber:

The movement shown above is from a Seiko Presage SARW027. It is only available in Japan. this timepiece was tribute to the First Automatic timepiece from Seiko since 1956. So this model has 1956 limited watches.

Other models that celebrate 60th Anniversary of the Seiko’s first Automatic are SRQ019J1 (aka SARK001 in JDM), SRQ021J1 (aka SARK003 in JDM) and SSA309J1 – all of which are from the Presage line.

Additional Resources:

• Official 6R27 instruction manual (pdf)
• Here is a press-release from 2016 that mentions the 6R27 in the Presage line.

Image above submitted by Nin Mungdee