Seiko Cal. 5638 - 527

The 5638-527 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5638 caliber with 20j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-5e0f1a6add6e]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

14.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

130m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1965

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