The XGL-731 was the third dive strap designed by Seiko. This was released in 1972 and was only supplied on the 6105-8110 dive watch in Japan. It has a distinctive design that make it instantly recognizable.Read More
In the 1960's mechanical watches were reaching their peak and a series of competitions to determine the most accurate watches in the world were being held in Switzerland. A couple of Seiko companies joined these competitions and within a few years were able to compete at the highest levels.
To understand how the companies performance was able to improve and rapidly evolve I have created a timeline showing the details of their results along with information on the key staff members and the details of the calibers developed.
More information about the competitions can be found HERE.
In 1968 Daini-Seikosha submitted 103 specially regulated 4520A movements to the Neuchâtel Observatory for Chronometer certification. 73 of these watches passed the certification and these were then placed into 18K gold cases and sold to the public as the 45GSN Astronomical Observatory Chronometer. Additional movements were certified in later years and Seiko finally offered 226 examples for sale.Read More
Gerald over at The Grand Seiko Guy has put together a comprehensive guide to the different variations of the original Grand Seiko model 3180 aka “First”. There were printed, carved and raised logo versions of the dials as well as multiple variations of these. This article details the differences and explains what to look for if you are trying to track down an original piece. There are numerous examples of franken models out there so this should be an invaluable resource for people looking to purchase the First Grand Seiko model.
Check out the full article here - A guide to the Grand Seiko “First” dial variations
I have made a number of updates to the Vintage Grand Seiko Bracelets article. This includes some additional photos of bracelets and some more details on the specific markings on some models.
I have also shown some photos of the very unique bracelet that comes with the 6185-8000. This bracelet reminds me a little of a lobster and it is unusual due to the double bracelet clasp and the way it is fixed to the main watch body.
The full article can be found HERE.
I have added a new book to the General Reference Books page. The book is called "Why are the hands of the clock clockwise? - Unraveling the mystery of clocks and time". The book has answers to general watch and time specific questions and is really only interesting to watch enthusaists because of the author, Oda Ichiro, who worked for Seiko sales and marketing in various positions for many years.
The specific book can be found HERE.
The link to the overview of the different Japanese watch reference books can be found HERE.
I recently added a couple of new books to the Official Company Publications section of the Japanese Watch Reference Books article.
The first was the original Japanese language version of the History of the Japanese Clock and Watch Industry (Vol.3) - Evolution of Seiko 1892-1923. The Japanese version is titled Development of Watch Industry and was published in 1984. Details of this book can be found HERE.
The second book I added was a very interesting volume titled Origin of Technology - Seiko Electronic Industry Postwar Watch Technological History. This book was published in 1991 by Seiko Instruments Inc. and contains a large number of official documents from the companies history as well as reports on the different technologies that have been implemented in the watch production process. There is information relating to the advances in machinery and how this has influenced their improvements in accuracy and production capabilities. This is a very interesting book and I have only seen the one volume ever come up for sale. More information can be found HERE.
The majority of vintage Grand Seiko's were supplied on leather straps but a number of models were supplied on bracelets. Over the years many of these bracelets have been separated from their original watches so I have detailed which GS models originally were supplied on a bracelet.Read More
In 1967 Seiko released the world's first 36,000 bph (5Hz) movement designed for ladies watches. This compact Hi-Beat caliber was used in various watches including the ladies Grand Seiko and GS VFA models. It is also possible that this is the only series of ladies 36,000 bph models produced by any manufacturer.Read More
The ZML01 a.k.a the "Waffle" strap was the first divers strap to be released by Seiko. This strap was supplied with a few different watches over it's production run. These straps are relatively rare today but luckily there are a few modern alternatives available.Read More
The yellow dialed 6139 Seiko has increased in popularity over the years since it was discovered to be the first automatic chronograph worn in space by Col. William Pogue. This model often incorrectly identified with numerous sites listing the watch with the wrong casing code.Read More
Many people may be aware of the five key features that identify the Seiko Five series of watches. What you may not be aware of is that these commonly quoted features were not exactly the same as those first defined by Seiko when the Sportsmatic 5 was announced in 1963.Read More
In the back of Seiko watches there is a range of information presented. This can tell you the movement type, date of manufacturer, how to open the case, which company produced the product, what the case is made from and the specific case design code.Read More
Seiko has had a long association with Railways in Japan that began in 1929 when they were selected as the first domestic watch approved by the Japanese Ministry of Railways. From then until today, Seiko has continued to produce models for use on the railways. While the technology powering these watches has evolved over the years the general design of these watches has remained consistent.Read More