Seiko Cal. 7131 - 988

The 7131-988 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 7131 caliber with 35j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-586113d428b2]

Also known as: Sumo, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

80m

Dial Color

Navy

Jewels

35j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1976

Related Models

• Seiko 7187-579
• Seiko 7159-625
• Seiko 6670-117
• Seiko 3872-317
• Seiko 0748-558
• Seiko 4448-830
• Seiko 3838-344
• Seiko 6314-992
• Seiko 5667-946
• Seiko 6651-297
• Seiko 4582-409
• Seiko 4525-956