Seiko Cal. 5644 - 720

The Seiko 5644-720 represents an important milestone in Seiko's 1970 lineup. It features a Silver dial protected by a Mineral crystal and offers 80m of water resistance. [seikata-wm-29eafa6cb71f]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Silver

Jewels

23j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1970

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