Seiko Cal. 6657 - 860

The Seiko 6657-860 represents an important milestone in Seiko's 1966 lineup. Powered by the 6657 caliber with 21j jewels beating at 36,000 bph, it delivers a 69 hours power reserve. [seikata-wm-c77b065ee355]

Also known as: Monster, Bullhead

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

41mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1966

Related Models

• Seiko 6126-515
• Seiko 5245-648
• Seiko 7044-367
• Seiko 0746-846
• Seiko 6153-976
• Seiko 6627-830
• Seiko 6652-730
• Seiko 7125-154
• Seiko 7118-510
• Seiko 7114-719
• Seiko 3898-408
• Seiko 5627-213