I was fortunate to have this obscure Seiko 6306 featured on HODINKEE over two years ago.
link In the time since that article
link was published there remains an air of mystery around Seiko models used during research in Antarctica. Slowly new details have emerged and when combined it paints a compelling story spanning from the early 62mas and
link 6159 dive watches all the way through Seiko Sumos and Samurais.