Seiko Cal. 6399 - 631

The 6399-631 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Silver dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-c029d6f119bb]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

13.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

Silver

Jewels

30j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1993

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