Seiko Cal. 5661 - 780

The Seiko 5661-780 represents an important milestone in Seiko's 1997 lineup. The Coin-Edge bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-c3ed115fa65a]

Also known as: Helmet

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Burgundy

Jewels

25j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1997

Related Models

• Seiko 6189-433
• Seiko 4446-348
• Seiko 7154-127
• Seiko 5240-630
• Seiko 6131-812
• Seiko 6381-652
• Seiko 3833-104
• Seiko 0786-483
• Seiko 6627-147
• Seiko 0791-248
• Seiko 6253-612
• Seiko 6152-297