Seiko Cal. 5640 - 776

Released in 1965, the Cal. 5640 with design code 776 was part of Seiko's domestic market collection. It features a Green dial protected by a Sapphire crystal and offers 130m of water resistance. [seikata-wm-e13aa35169cd]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

130m

Dial Color

Green

Jewels

35j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1965

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