Seiko Cal. 6131 - 235

The 6131-235 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6131 caliber with 31j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-3caa714ad308]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

31j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1991

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