Seiko Cal. 0731 - 904

This Spring Drive model from 1999 features a 39mm Two-Tone case. Powered by the 0731 caliber with 32j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-95abb3c1553d]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

9.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1999

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