Seiko Cal. 6391 - 312

The 6391-312 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6391 caliber with 19j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-c17594c677b1]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Silver

Jewels

19j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1998

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