Seiko Cal. 5641 - 387

This Quartz model from 1982 features a 37mm Gold-Plated case. It features a Silver dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-5be24faea78e]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Silver

Jewels

34j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1982

Related Models

• Seiko 6328-438
• Seiko 5692-889
• Seiko 7141-851
• Seiko 7181-738
• Seiko 6285-889
• Seiko 5648-509
• Seiko 4447-198
• Seiko 3876-616
• Seiko 3821-178
• Seiko 4472-364
• Seiko 6367-198
• Seiko 6120-131