Seiko Cal. 5640 - 361

The 5640-361 is a sought-after Quartz piece from Seiko's golden era. It features a Champagne dial protected by a Mineral crystal and offers 190m of water resistance. [seikata-wm-37cc839f8700]

Also known as: Helmet, Crown

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

13.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

18j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1969

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