Seiko Cal. 5641 - 751

Released in 1968, the Cal. 5641 with design code 751 was part of Seiko's domestic market collection. With its 18mm lug width and 15.0mm profile, it sits comfortably on most wrists. [seikata-wm-1bfae0cb8f2b]

Also known as: Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

15.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1968

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