Seiko Cal. 5661 - 540

The 5661-540 is a sought-after Spring Drive piece from Seiko's golden era. The Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-8e3e0dc16cd9]

Also known as: Shogun, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

90m

Dial Color

White

Jewels

30j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1982

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