Vintage Seiko 5 wristwatch, Cal 4206B Complete the reassembling.

Vintage Seiko 5 wristwatch, Cal 4206B Complete the reassembling.

Today I completed the reassembly of the 1981 Seiko 5 calibre 4206D Case no; 0500 Serial number 167431 Women's wristwatch.

This is the smallest mechanical watch movement I have worked on so far, being smaller than a “Twenty Pence” piece coin!

Smaller than a “Twenty Pence” piece coin!

Day and Date mechanisms fitted along with minute, hours wheels etc.

Day and Date mechanisms fitted

 I did waste a bit of time looking for the Day Jumper Spring, which decided to fly off! 

Day Jumper Spring

Dial and Hands fitted and movement refitted into the watch case

Tested the hands at the 9o/c and 3o/c positions, Spot on!

Tested the hands at the 9o/c and 3o/c positions

Placed movement on the timing machine and readings are good. Will let the movement run a few days to settle down, then I will regulate it.

movement on the timing machine

Vintage Seiko 5 wristwatch, Cal 4206B. Reassembling Part 2.

Vintage Seiko 5 wristwatch, Cal 4206B.  Reassembling Part 2.

More time spent in the workshop today, so completed the reassembling of the Train Wheels, Pallet Fork, Complete Balance, Cleaned Balance Cock Diashock, Barrel and Click, and then fitted the Automatic winding Mechanism fitted on the Vintage Seiko 5 wristwatch, Cal 4206B.

Train Wheels and Barrel Fitted 

Taken some "X-Ray" pictures of the Fourth and Third wheels under the microscope.

 

X-Ray photograph of the Fourth Wheel

X-Ray photograph of the Third Wheel

The Movement is running well with good aptitude on the Balance Wheel video.

My YouTube video of movement running with Balance Cock Diashock removed for cleaning

My YouTube video with the Movement running well with good aptitude on the Balance Wheel.

Rotar fitted so the rear side of movement completed

So next time move to the dial side, to reassemble the Day and Date calendar wheels, etc and complete the reassembling of the movement.

Vintage Seiko 5 wristwatch, Cal 4206B, Start of reassembling part 1

Only a small amount of time in the workshop today, but I did start the reassembling of the small Vintage Seiko 5 wristwatch, Cal 4206B.

Checking on the microscope for cleanliness and any broken parts as I go.

Notice a hair on the mainplate! Removed and also dried oil on one of the Pivots, which I removed with Pegwood.

Notice dried grease on a pivot and removed with Pegwood.

Removed, cleaned and oiled the diashock on the mainplate.

Diashock photographed under the microscope

Then completed the reassembling of the Winding mechanism, and tested in all three stem positions and working well.

Dial side of the winding mechanism photographed under the microscope.

Train side of the winding mechanism photographed under the microscope.

Train side of the winding mechanism photographed under the microscope

Vintage Seiko 5 wrist watch with Cal 4206B

Back to working on a mechanical watch movement today, after doing a lot of quartz watches.

Seiko 5 Automatic, 17 Jewels, Calibre 4206B 

This one is a vintage Seiko 5 Automatic, 17 Jewels, Calibre 4206B with instant calendar Day and Date setting device.

Movement disassembled and all parts cleaned and ready for reassembling.

Seiko 5 Automatic, 17 Jewels, Calibre 4206B 

At least I have the Seiko Technical sheet to guide me in reassembling the 76 parts, in 63 stages. 

Seiko 5 Automatic, 17 Jewels, Calibre 4206B Technical Guide

Vintage Seiko 5 Automatic Mechanical Movement service

Today I started the service on the smallest Automatic Mechanical Movement I have so far worked on.

This watch is a Vintage Seiko 5 Automatic fitted with the Seiko 4206/B Mechanical Automatic Movement.

I found the Parts and Technical sheets for the movement online, so I have something to work to when servicing the movement.

I will have to use my strongest Loupe when working on this caliber of watch.

Fingers crossed I don’t lose or break a part!