Seiko Cal. 3821 - 631

The 3821-631 is a sought-after Kinetic piece from Seiko's golden era. It features a Black dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-68beebf2b684]

Also known as: Silverwave, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

12.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

22j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1970

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