Seiko Cal. 5640 - 275

Released in 1965, the Cal. 5640 with design code 275 was part of Seiko's domestic market collection. It features a Black dial protected by a Hardlex crystal and offers 100m of water resistance. [seikata-wm-d37cdb4da5d4]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

100m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1965

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