Seiko Cal. 5640 - 361

The Seiko 5640-361 represents an important milestone in Seiko's 1975 lineup. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-cf4399c225f7]

Also known as: Arnie

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Burgundy

Jewels

29j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1975

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