Seiko Cal. 6645 - 378

This Hand-Winding model from 1988 features a 41mm Hardlex-Coated Steel case. It features a Cream dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-074de5eda0e1]

Also known as: Samurai, Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

23j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1988

Related Models

• Seiko 4523-673
• Seiko 5254-663
• Seiko 5223-321
• Seiko 6147-665
• Seiko 4547-522
• Seiko 7016-101
• Seiko 0792-640
• Seiko 5657-899
• Seiko 4585-461
• Seiko 0752-343
• Seiko 4425-531
• Seiko 7015-777