Seiko Cal. 5640 - 180

Released in 1975, the Cal. 5640 with design code 180 was part of Seiko's domestic market collection. Powered by the 5640 caliber with 33j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-ad1e14b34e47]

Also known as: Golden Tuna, Flighty

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

13.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

33j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1975

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