2015年01月13日

How to open a one-piece watch case


How to open a one-piece watch case of seiko(56series watch-movement).


【CAUTION!!】
This is an amateur 's method, please be on your own risk.
I will take no responsibility even if you break an important watches.
And,I can not guarantee the accuracy of the contents.

The wristwatch that can be opened this time is King Seiko KS 5621-7000.
This watch is a one-piece case of plastic windshield.
In this case you need a special one-piece case opener 「seiko s-14」.
One-piece case opener is not necessary for one piece case of glass windshield.


Remove the wristwatch belt and start working.
By the way, this watch lag width is 19 mm and the choice of the belt is small.
I guess I'll try it because there are also 19 mm solid bracelets such as Jerancha.


Things to prepare
・ watch
・ Pry-open(koji-Ake)
・ SEIKO one-piece case opener S-14
・ Tweezers, spring bar removed
・ Rubber gloves, dust blowers - etc.
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●First,remove the bezel with pry-open
In the case of King Seiko, there is a dent in the bezel to insert pry-open
1-1-thumbnail2.jpg

●When removing the bezel…
Set the attachment that matches the windshield to the one-piece case opener.
So that the opener and the attachment become flat.
2-1-thumbnail2.jpg

●Remove windshield
Set the opener in the windshield and squeeze lightly to the extent that the clock does not fall.
Squeeze it further by 2 memories from there.
If you take off the opener from the watch, the wind shield will also come off.
6-2-thumbnail2.jpg

3-2-thumbnail2.jpg


●This time I will take out the watch movement as well.
Red circle part is Oshidori(like human ear)
4-1-thumbnail2.jpg
→ The part of the red line is the ring for fixing the movement.
→ Pull out the crown while pressing the Oshidori with tweezers etc. from above.
→ Furthermore, shift the fixing ring counterclockwise with tweezers etc.
→ Remove the screw of the adjustment device from the outside of the case.
→ Remove movement (per dial) from dial side.
3-3-thumbnail2.jpg

4-3-thumbnail2.jpg

A movement number is engraved on the plate.
56 series movements are not decorative, but they are very beautiful.
The number of parts of the movement is very low, 80th.
(seiko cronos with a hand winding and non-date is made up of about 80 parts.)
It seems easy to disassemble and easy to assemble.





Movement of Series 56 has accuracy which can easily pass chronometer test.
I think that there is no wasteful beauty as industrial products, not the direction of the decorated crafts.
The weak point of the swing lever stands out only in this good thing.

●The external adjustment device
The external adjustment device is installed only in King Seiko.
It is the red circle part of this image.
5-thumbnail2.jpg
→ There is a small screw in the screw of this image for external adjustment.
→ You can not adjust the watch even if you turn the screw of the image.
→ Packing is attached to the screw of this image, so replace to the new packing.

This external adjustment device is mounted only in 56 series King Seiko.
It is a mechanism that neither Lordmatic nor Grand Seiko of the same 56 series has.
And,there is no one piece case specification for 56 series Grand Seiko.

About from 1973,King Seiko which was initially one piece case specification had switched to the screw back specification case.
I think that the screw back case was better in waterproof performance than the one piece case.

●Installation
Next I will return to the removed wind shield.
→ Put the wind shield on the one attached to the one-piece case opener.
→ Put the movement into the case.
→ And  return to the crown while pressing the Oshidori with tweezers etc.
→ Return the fixing ring to the movement fixed position.
→ Clean the dust of the dial with a dust blower.
6-1-thumbnail2.jpg

Set the windshield in the watch,squeeze about 2 memories of the windshield with the one piece case and push it from above
Attention to windshield is the most fragile at the time of installation!!

Installation is completed.
6-3-thumbnail2.jpg
Although it looks easy,I think the draft shield is very difficult to install as compared with removal. 
Seiko watch bezel is difficult to install unless there is something that can be pressed firmly like a special installation machine.




posted by たいぞう at 00:00 | Comment(0) | English | このブログの読者になる | 更新情報をチェックする

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