Seiko Hi-Beat Automatic 2206-0180S

A fully featured women’s timepiece

Early in the hunt for serviceable timepieces I noticed how difficult it is to find watches for women which share the same features as those for men. While it’s expected that a quality mens automatic watch will have a day and date feature, should you try to find the same features in a watch designed for a woman you often have to accept a quartz movement.

There are exceptions of course.  Omega offered the Ladymatic sometime back and now offers the Aqua Terra with an automatic movement, and of course Rolex have their Oyster Perpetual Datejust, but otherwise the pickings are slim. It seems today most watches designed for narrower wrists will have a quartz movement.

IMG_0683I did however stumble across this wonderful Seiko Automatic. The watch was in poor shape when I received it although it did tick. The crystal was scuffed badly and the bracelet held more grime than I would have thought possible but otherwise the piece was in good order.

I liked this watch because it sported a fully automatic movement along with a day and date window. Once I had a chance to fiddle with it a bit I discovered that there is also a quickset for both the date and day of the week (very nice) and the engine (Seiko 2206A) is a high beat movement, clocking in at 28,000 beats per hour (or eight ticks per second) making it the first high beat movement I’ve serviced. That’s an amazing amount of features to find in mechanical womens watch.

This should clean up nicely I think

Generally the first thing I do when I get a new watch is place it on the timegrapher to get a general idea how far out of spec it is. This one was in rough shape with very poor amplitude and an exceptionally high beat error of 8.0ms.

Ugh, those are ugly vitals

Unscrewing the caseback gave me my first look at the movement which was unadorned but decent.

It’s is not highly decorated as one would expect from a quality Swiss movement
The important thing is how well it’s engineered

The first gremlin appeared when I removed the case screws- one had sheared off in the movement.

Uh-oh, that’s a broken screw at the top

This hiccup didn’t stop disassembly though and soon enough the movement was out of the case.

Oh, I wish all dials came out of the case looking this good

As I had hoped the dial was in very good condition so much care was taken with its removal.

Not too intimidating

Although this was not a chronograph movement, it had both a calendar and auto-winding mechanism, so I took many pictures during disassembly to guide me during reassembly. As each piece came away I was pleased by the general lack of grime and oxidation.

Look at all those gears and levers!

For watches with calendar functions, you will usually find all the gears and levers which operate the calendar directly under the dial. These pieces must be removed first so that you can remove the cannon pinion which is attached to the shaft of the center wheel. The center wheel is the second wheel in the gear train of the time keeping mechanism. It cannot be removed until the cannon pinion has been lifted off.

Unfortunately the remainder of my pictures of the dial side were blurry so I’ll skip straight to disassembly of the topside.

Down to the barrel bridge
The hairspring looks a bit distressed

The gear train is not nearly as complicated as the calendar works but it did offer a few surprises. To get an idea of how tight the tolerances are in this movement note how the very tip of the stem extends through the pilot hole and rests just above the center wheel. The distance between the wheel and stem is probably 0.1 – 0.2mm!

With a small movement it’s a very tight fit

As usual the last bit to be disassembled is the setting mechanism. Here we have a more complicated setup in order to accommodate the quick set features.

The setting mechanism is a bit complicated due to the calendar quickset

I turned my attention to the broken off screw once disassembly was complete. Luckily for me I was able to thread the remainder of the screw all the way through the plate by grabbing the tip with my tweezers.  Usually you don’t get so lucky with broken screws.

There was just enough of the screw to grab with my tweezers

A replacement crystal, mainspring, and balance were ordered to complete the service. The mainspring is wrapped pretty darn tight in the barrel since this is a high beat movement so I was thankful Seiko sold replacement mainsprings pre-wound in a new barrel.

A replacement mainspring already in the barrel
It’s starting to come back together now

I wouldn’t have needed a replacement balance except that I managed to fling the old one all the way across the workbench with a flick of the tweezers. This being after I painstakingly fixed the spacing of the hairspring coils! Sometimes all you can do is shake your head. Fortunate for me, a replacement balance was easily sourced and turned out to be quite affordable. I may have to consider working on Japanese watches full time.

New old stock balance complete still in the box
Everything installed except the rotor

With replacement parts in hand, assembly proceeded quickly and uneventfully; however, the replacement crystal I ordered wasn’t a proper fit so instead I broke out the Polywatch and got to work polishing the old one.

The original crystal polished up nicely and was pressed back into the case

During testing I was quite concerned to discover that the movement wouldn’t register a day change until several hours after the date had changed. Anxiety turned to relief after finding Seiko’s own advise regarding day/date change and that it should occur approximately between the hours of 9:00PM and 4:00AM. It’s not exactly snappy but it will do.

Hands are refitted

The timegrapher confirmed this watch has a lot of life left in it as it has the most consistent beat and amplitude of any watch I’ve worked on regardless of the tested position. This was surprising since I had to replace the complete balance assembly.  I’ve done the same for two Swiss watches and even after burnishing pivots and trimming the hairspring I still couldn’t get such a consistent beat.  This balance was ready to go straight out of the box. I’m starting to really like Seiko…

This is pretty close to perfect timekeeping

With the gaskets greased the movement was ready for casing.

The movement is recased and ready for the rotor
Fully cleaned and serviced

Multiple runs through the ultrasonic cleaner and quite a bit of elbow grease brought the bracelet back from the dead and a bit of Scotchbrite didn’t hurt either.


If you’re going to purchase a mechanical watch you can do a lot worse than a Seiko. This watch didn’t cost a lot of money to purchase, nor much to repair and it came out beautifully.  Best of all, it keeps fantastic time. There isn’t much more to say after that!

Author: JPMoeller

Amateur watchmaker and California resident

7 thoughts on “Seiko Hi-Beat Automatic 2206-0180S”

  1. Very nice!
    I think you were just playing a with some Pierce chronographs but now you took on some serious stuff, like a Seiko lady!
    I am kidding! I admit this little gem is not easy to service, but it doesn’t compare to a Pierce chrono!


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  3. I ve bought it. And now, i guess a hairspring not good working out.. i should to try repair…need your advices for a hairspring part..tq.


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