Seiko Cal. 5644 - 378

The Seiko 5644-378 represents an important milestone in Seiko's 1978 lineup. It features a Burgundy dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-b23ab6ba2ec6]

Also known as: Tuna, Silverwave

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

90m

Dial Color

Burgundy

Jewels

35j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1978

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