Seiko Cal. 5663 - 378

The Seiko 5663-378 represents an important milestone in Seiko's 1974 lineup. It features a Navy dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-677841eef3de]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

10.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

180m

Dial Color

Navy

Jewels

34j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1974

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