Seiko Cal. 6331 - 613

The 6331-613 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6331 caliber with 26j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-fb90294cce0c]

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Silver

Jewels

26j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1969

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