Seiko SBDA003 200m Ti Diver with automatic movement

Functions: hours, minutes, sweep seconds; date

Case: titanium, diameter 42 mm, height 14 mm; uni-directionally rotating bezel; highly knurled screw down crown; mineral crystal; water-resistant to 200 metres

Dial: blue; luminous markers and hands

Band: original titanium bracelet; folding clasp with security link

Made in Japan and only available in Japan (thank you Higuchi-san!)

This is a sharp watch, literally.  The markings, the sound of the ratcheting bezel, even the case design's angular nature present sharpness to the  senses:

Extremely light weigh for the size, a wear all day watch.  The Ti on the bracelet is not quite as hard as my Citizens' Duratech, but still wears stronger than steel.