Seiko Cal. 5640 - 988

This Automatic model from 1970 features a 39mm PVD Black case. It features a Burgundy dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-1c0a73af5caa]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Burgundy

Jewels

19j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1970

Related Models

• Seiko 4518-571
• Seiko 5679-725
• Seiko 6269-136
• Seiko 6384-522
• Seiko 6129-227
• Seiko 5660-567
• Seiko 6196-977
• Seiko 7112-950
• Seiko 5296-455
• Seiko 4470-669
• Seiko 5260-132
• Seiko 7038-664