Seiko Cal. 5640 - 360

The 5640-360 is a sought-after Spring Drive piece from Seiko's golden era. It features a Burgundy dial protected by a Mineral crystal and offers 130m of water resistance. [seikata-wm-6aba9d22faea]

Also known as: UFO, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Burgundy

Jewels

21j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1971

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