Seiko Caliber 6117b

Seiko Caliber 6117B

Seiko Caliber 6117b

Brand Seiko
Caliber Number 6117B
Base Caliber 6117A
Movement Type Automatic
Jewels 17
Vibrations Per Hour
21,600 bph
Power Reserve 47 hours
Diameter 12”’ (27mm)
Thickness 5.25mm
Shock System Diashock
Mainspring 401615
Balance Staff 315611
Stem 357611 (Seiko)
Hands 1.5 x .90 x .20
Hacking? Yes
Manual Winding? No
Crown Location 2:00
Functions Hours, minutes, central seconds, GMT hand, date
Country of Manufacture Japan
Known Models Navigator World Timer (6117-6419T)

The Seiko caliber 6117B is a vintage automatic dual time GMT movement that was found in the recently re-popularized Navigator Timer watches. This caliber was produced between circa 1968-1975. In 1975, Seiko began producing the caliber 6118A which has the same jewel count and Diashock anti-shock protection.

Difference between 6117A and 6117B?

There are two variations of the 6117: A and B. They are basically the same movement, however, the B adds a desirable hacking feature.

mwbuss8 posted this comment about the Seiko 6117 on thewatchsiteforums:

You’re right, parts are tough to source. Be careful with the stem, some sellers out there will advertise as having them for this movement but they lack the feature to rotate the inner bezel. I have the older 6117 6019 world timer. If you have yours serviced and adjusted I’m sure it can be much more accurate than a minute. When I got mine it was in a jar of broken watch parts. The crystal was so bad I could barely read the dial, but by the time I had it out of the jar it was ticking away. over they course of the next 3 days I checked it against an atomic clock and it was only a few seconds off. the 6117 is an AMAZING movement. In regards to movement parts if you ever need them many parts of the entire 6xxx line are shared.

Seiko Caliber 6117 Seiko 6117b Movement Seiko 6117 World Time

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Anthony Triana
Anthony Triana

Hello! Quick question. I recently purchased a Seiko 6117-6400 World Time watch that dates to December 1969, which has the 6117B movement. I recently had it serviced and noticed that it was returned without the hacking function working from the watchmaker. Upon asking about this, he preceded to explain that there was a period of time when Seiko did not make the movement with a hack lever – apparently it’s completely missing from this movement. Wanted to ask whether this is indeed the case, and if so, when this “period of time” might be?

David Larry
David Larry

When you say “it was returned without the hacking function working” does that mean it was hacking before you sent it to the guy for service?

Anthony Triana
Anthony Triana

No, as far as I know, it never hacked. It was a recent purchase from a jewelry store and the watch had been sitting for years. Just by doing a little research, looks like all 6117B movements hacked, so trying to find out if they are all supposed to have a hacking lever or if there indeed was a time when these calibers were not issued with a hacking mechanism direct from Seiko.