Seiko Cal. 3851 - 640

The Seiko 3851-640 represents an important milestone in Seiko's 1971 lineup. It features a Green dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-c8ec145e51f9]

Also known as: Rally, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

11.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Green

Jewels

36j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1971

Related Models

• Seiko 4528-544
• Seiko 7190-619
• Seiko 5656-930
• Seiko 4432-418
• Seiko 3889-629
• Seiko 6140-430
• Seiko 5639-801
• Seiko 7149-367
• Seiko 5677-379
• Seiko 5623-246
• Seiko 6358-364
• Seiko 4494-587