Seiko Cal. 6641 - 505

The Seiko 6641-505 represents an important milestone in Seiko's 1978 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 190m of water resistance. [seikata-wm-be4cc3f32b80]

Also known as: Monster, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1978

Related Models

• Seiko 6128-847
• Seiko 4585-940
• Seiko 7062-289
• Seiko 5672-527
• Seiko 4536-516
• Seiko 6338-708
• Seiko 6222-291
• Seiko 4514-921
• Seiko 0753-453
• Seiko 6261-267
• Seiko 6636-985
• Seiko 6334-183