Seiko Cal. 5640 - 312

This Spring Drive model from 1965 features a 45mm Titanium case. It features a White dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-f64a1985f3f7]

Also known as: Tuna, World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

13.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

White

Jewels

23j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1965

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