Seiko Cal. 3818 - 647

The Seiko 3818-647 represents an important milestone in Seiko's 1971 lineup. It features a Black dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-4bc3dbc8fd04]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

13.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Black

Jewels

23j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1971

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