Seiko Cal. 6640 - 438

This Automatic model from 1981 features a 40mm Titanium case. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-e232a21ee48a]

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

40mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

130m

Dial Color

Burgundy

Jewels

25j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1981

Related Models

• Seiko 6251-302
• Seiko 7063-537
• Seiko 6339-638
• Seiko 6247-271
• Seiko 3829-670
• Seiko 5665-300
• Seiko 6152-164
• Seiko 4531-407
• Seiko 6382-312
• Seiko 3857-281
• Seiko 4439-471
• Seiko 6114-169