Seiko Cal. 5640 - 402

The 5640-402 is a sought-after Hand-Winding piece from Seiko's golden era. The Fixed bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-d5589ba416ab]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

9.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

200m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1991

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