Seiko Cal. 6317 - 390

The 6317-390 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6317 caliber with 25j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-23e8f6e64d61]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1980

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