Update: 50th Anniversary of the first automatic chronograph - Seiko’s 6139

I have updated the article about the first release of the 6139 chronograph to include an article from the Suwa Seiko internal company newsletter. This article supports the May 1969 market introduction date of the models.

The revised article on the release of the Seiko 6139 chronographs can be found here:
50th Anniversary of the first automatic chronograph - Seiko’s 6139

Update: 50th Anniversary of the first automatic chronograph - Seiko’s 6139

Another example of a Seiko 6139-6010 chronograph with a January 1969 produced case has been discovered. This watch has the serial number of 910170 and is just 21 units from the only other known January 1969 example.

I have also just added a February 1969 produced 6139-6000 model to my collection. Now I need to track down a January example.

I have updated my previous article on the release of the Seiko 6139 chronographs and this can be found here:
50th Anniversary of the first automatic chronograph - Seiko’s 6139