Picked this up recently at Yodobashi in Kyoto.
Some specs copied from Seiya's website :-
Case: SS
Strap: Leather
Crystal: Sapphire
Diameter: 40.3 mm (without the crown)
Thickness: 12.4 mm
Movement: 6R15 23J Automatic (with Hand winding and Hack function)
Accuracy: +25/-15 sec/day
Power reserve: 50 hours
Lumi bright: hands and makers
10 ATM water resistance
To me an attractive and affordable watch. Indices style similar my Nomos Club.