Seiko Cal. 6634 - 909

This Hand-Winding model from 1978 features a 40mm Hardlex-Coated Steel case. With its 18mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-686661e9b480]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Black

Jewels

21j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1978

Related Models

• Seiko 4510-846
• Seiko 6275-709
• Seiko 6230-571
• Seiko 6269-716
• Seiko 4589-249
• Seiko 7010-634
• Seiko 6335-616
• Seiko 6312-688
• Seiko 6123-353
• Seiko 6173-822
• Seiko 6272-804
• Seiko 6399-565