Seiko Cal. 0731 - 641

Released in 1965, the Cal. 0731 with design code 641 was part of Seiko's domestic market collection. It features a Green dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-24977cd8ee8a]

Also known as: Samurai, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1965

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