Seiko Cal. 6391 - 904

The Seiko 6391-904 represents an important milestone in Seiko's 1971 lineup. It features a White dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-32ecf351bfe6]

Also known as: Silverwave

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

13.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

90m

Dial Color

White

Jewels

23j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1971

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