Seiko Cal. 3864 - 637

The Seiko 3864-637 represents an important milestone in Seiko's 1981 lineup. With its 20mm lug width and 14.0mm profile, it sits comfortably on most wrists. [seikata-wm-8b9e0d089c48]

Also known as: Monster, Silverwave

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

14.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

32j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1981

Related Models

• Seiko 7175-519
• Seiko 4592-491
• Seiko 6260-152
• Seiko 3852-657
• Seiko 0743-822
• Seiko 6384-384
• Seiko 6238-845
• Seiko 7127-160
• Seiko 3835-819
• Seiko 4428-712
• Seiko 4523-380
• Seiko 7182-283