Seiko Cal. 6313 - 991

The 6313-991 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6313 caliber with 31j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-a2d8cf873ca1]

Also known as: Bullhead, World Timer

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

40mm

Case Thickness

8.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1975

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