Seiko Cal. 5638 - 227

The 5638-227 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5638 caliber with 25j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-2f446cc3d2bc]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

10.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1985

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