Seiko Cal. 5644 - 820

The 5644-820 is a sought-after Kinetic piece from Seiko's golden era. It features a Silver dial protected by a Hardlex crystal and offers 110m of water resistance. [seikata-wm-06bcb1ff634c]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

110m

Dial Color

Silver

Jewels

18j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1975

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