Seiko Cal. 6387 - 637

This Spring Drive model from 1977 features a 39mm Titanium case. It features a Champagne dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-9962fc97af9c]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Champagne

Jewels

27j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1977

Related Models

• Seiko 7091-505
• Seiko 0718-702
• Seiko 6242-891
• Seiko 7038-269
• Seiko 4531-328
• Seiko 4427-339
• Seiko 5667-473
• Seiko 4494-903
• Seiko 6274-431
• Seiko 4525-493
• Seiko 6647-792
• Seiko 4445-288