Seiko Cal. 5223 - 638

The Seiko 5223-638 represents an important milestone in Seiko's 1978 lineup. Powered by the 5223 caliber with 30j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-82b9328ba7e1]

Also known as: Navigator, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

46mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1978

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