Seiko 4207 rubbing barrel

[Tmuir]

I was recently given a Ladies Seiko 4207 automatic watch to service.

This will be the first time I've serviced a ladies automatic watch.

The watch was given to me not running but no information as to why it had stopped running.

On removing the back cover it became obvious there was a problem.

Look at the photo below, see the dark circle on the barrel with the red arrow pointing at it.

That is an actual wear mark into the cover on the barrel, so obviously something is rubbing on it. I couldn't see anything obvious as to what was rubbing so I started to strip it down.

On removing the day wheel I was surprised to see cross head screws holding on the day jumper, and went and grabbed my new Horotec crosshead screw drivers I had just recently purchased. Imagine my surprise when I discovered the smallest one at 1.2mm was too big.

After some digging on Cousins I have found the AF make a 'Seiko' cross head screwdriver for the 9S26 which is 0.98mm, so I've added that to my next order. Hopefully it is small enough.

Sorry about the quality of photos but my camera recently broke and will no longer focus. I now need to move my camera closer or further away from what I am photographing to get it to focus.

Doesn't matter how many tools you have, you always need another one.............

Edited May 12, 2018 by Tmuir

[Chopin]

Those screws are present on many Seiko movements. I just screw/unscrew mine with the smallest flat screwdriver that I have which is 0,8 or so. It's still a bit big but if you improvise a bit you can do it.

Is that circle mark really a worn out part or just dried out gunk/debris/lubricant ?