Seiko Cal. 6378 - 770

Released in 1981, the Cal. 6378 with design code 770 was part of Seiko's domestic market collection. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-aecdbdb00ea7]

Also known as: Monster, Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

24j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1981

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