Seiko Cal. 5644 - 591

Released in 1969, the Cal. 5644 with design code 591 was part of Seiko's domestic market collection. The Bidirectional bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-5d03bb51ddc2]

Also known as: UFO, Crown

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

10.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Silver

Jewels

36j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1969

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