Seiko Cal. 0731 - 931

The 0731-931 is a sought-after Automatic piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-334f5c360d2b]

Also known as: Bellmatic, Golden Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Green

Jewels

32j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1966

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