Seiko Cal. 5661 - 436

The 5661-436 is a sought-after Spring Drive piece from Seiko's golden era. With its 22mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-c87ebeb5ac70]

Also known as: Turtle, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1978

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