Seiko Cal. 3891 - 630

Released in 1967, the Cal. 3891 with design code 630 was part of Seiko's domestic market collection. It features a Silver dial protected by a Acrylic crystal and offers 50m of water resistance. [seikata-wm-6ae89071cb97]

Also known as: Sumo, Tuna

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

23j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1967

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