Seiko Cal. 6315 - 637

Released in 1966, the Cal. 6315 with design code 637 was part of Seiko's domestic market collection. Powered by the 6315 caliber with 21j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-600f8be4ab43]

Also known as: Samurai, Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

8.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1966

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