WS 22: Servicing a SEIKO 7005 including replacing the balance


I had found this watch on the Jatujak market (Bangkok's biggest weekend flea market) on August 12th 2002. Almost exactly three years later, I finally found the time and courage :) to clean it. This time without my watch tutor Rob B. OK, I had to call Rob twice. First on how to get some information on how to take the balance off. And again on how to open the main barrel. Please find Rob's great article about the "Seiko Workhorse" where he describes an overhaul and features of the SEIKO Caliber 7005 and also compares it to the 7009 and 7S26 and 7S36 calibers.

Here is the link to the story of that watch hunting day at Jatujak

More pictures of the watch on an original SEIKO vintage bracelet are here

Reto Castellazzi, Bangkok, August 22nd (cleaning), 23rd (spring work) and 25th (writing) 2005

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Click here to start the tour or click on any thumbnail >>>


The Start

Open case and Hairspring Detail
 (2 pictures)

Rotor removed

Magic Lever explained

Dial Side

The Balance

Balance Wheel disconnected

Barrel and Automatic Winding System (upside down)

Lever Fork (upside down)

Open Mainspring Barrel

Cleaning Basket (Tea filters)

Small Parts

Big Parts

The Ultrasonic Cleansing Machine (3 pictures)

Rinsing (2 pictures)

Did the Hairspring return to its perfect curvature after the bath?

Old and new Hairspring

The Mainspring

The last Hurdle! A broken Spring Bar Pin in one of the Lug Holes!

The End