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