Seiko Cal. 6657 - 131

The 6657-131 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-42f0bba041a0]

Also known as: Sumo, Crown

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1976

Related Models

• Seiko 0711-198
• Seiko 7138-880
• Seiko 4423-873
• Seiko 6179-386
• Seiko 3841-231
• Seiko 6632-105
• Seiko 6333-474
• Seiko 6190-943
• Seiko 5240-534
• Seiko 0738-993
• Seiko 4477-688
• Seiko 4590-215