Shinkai 6500
Owned and operated by the Japan
Marine Science and Technology
Centre (JAMSTEC), the submersible
Shinkai 6500 is capable of diving to a
depth of 6500 meters, making it the
deepest-diving research submersible
currently in use in the world today. On
August 11, 1989 it reached a depth of
6,526 meters in the Japan Trench off
Sanriku, Japan.
Seiko 6306-7001

Case Diameter: 44 mm
Case Height: 14 mm
Case length: 46 mm
Lug Width: 22 mm
Movement: Seiko 6306 21 jewel
hacking automatic. Quick-set
day-date, 21,600 bph.
Case material: Stainless steel
Crown: Screw down
Bezel: Bi-directional, indexed w/
60 clicks
Water resistance: 150 meters
Vintage: 1979
Seiko 6306

Identical in appearance to the 6309, it is water resitant to 150 meters. Unlike the 6309, it uses a
21 jewel "hacking" movement (compared to the 17J non-hacking movements in the 6309s). The
date wheel is in English and Kanji. The 6306 divers are much rarer to find than the 6309s
because their production years were relatively short and they were Japan market only model.

Seiko has a long history of producing professional dive watches that continues today.
6309 (left) & 6306 (right)