Seiko Cal. 6157 - 644

The 6157-644 is a sought-after Solar piece from Seiko's golden era. Powered by the 6157 caliber with 30j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-f9a66e7ee999]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

100m

Dial Color

White

Jewels

30j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1987

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