Seiko Cal. 5661 - 421

The 5661-421 is a sought-after Kinetic piece from Seiko's golden era. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-9aaa6dfce9d3]

Also known as: Monster

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

14.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

60m

Dial Color

Navy

Jewels

24j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1967

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