Seiko Cal. 5641 - 257

This Hand-Winding model from 1973 features a 43mm PVD Black case. It features a Champagne dial protected by a Mineral crystal and offers 80m of water resistance. [seikata-wm-ffdfd9bbef49]

Also known as: Tuna, Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

43mm

Case Thickness

12.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Champagne

Jewels

27j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1973

Related Models

• Seiko 6640-916
• Seiko 6293-305
• Seiko 6261-574
• Seiko 4470-633
• Seiko 4520-549
• Seiko 6213-204
• Seiko 5678-259
• Seiko 4425-788
• Seiko 0718-205
• Seiko 4551-809
• Seiko 7036-959
• Seiko 6658-521