Seiko Cal. 5631 - 599

The 5631-599 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5631 caliber with 36j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-49409603661d]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

9.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

White

Jewels

36j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1985

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