Seiko Cal. 6397 - 742

The 6397-742 is a sought-after Spring Drive piece from Seiko's golden era. It features a Silver dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-c1535ee77c21]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

9.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Silver

Jewels

34j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1974

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