Seiko Cal. 6642 - 723

The Seiko 6642-723 represents an important milestone in Seiko's 1988 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 80m of water resistance. [seikata-wm-dacb5e44605e]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Titanium

Case Width

46mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1988

Related Models

• Seiko 3815-256
• Seiko 7164-452
• Seiko 5667-132
• Seiko 5684-202
• Seiko 4443-873
• Seiko 3827-157
• Seiko 3845-452
• Seiko 5299-315
• Seiko 3899-840
• Seiko 6188-463
• Seiko 7114-281
• Seiko 6115-359