Seiko Cal. 6638 - 512

This Automatic model from 1991 features a 40mm Two-Tone case. Powered by the 6638 caliber with 26j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-353f7d233310]

Also known as: Bullhead, Rally

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1991

Related Models

• Seiko 5666-422
• Seiko 6378-122
• Seiko 3896-421
• Seiko 6163-716
• Seiko 7134-653
• Seiko 5219-993
• Seiko 7098-821
• Seiko 4435-598
• Seiko 5641-231
• Seiko 3882-733
• Seiko 3880-770
• Seiko 4511-438