Seiko Cal. 6631 - 755

This Spring Drive model from 1974 features a 46mm PVD Black case. The Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-b66d845f2b8f]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Silver

Jewels

33j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1974

Related Models

• Seiko 6129-266
• Seiko 7010-816
• Seiko 6365-553
• Seiko 6228-228
• Seiko 6174-819
• Seiko 7157-505
• Seiko 6399-303
• Seiko 4537-983
• Seiko 6671-618
• Seiko 6678-436
• Seiko 7090-615
• Seiko 7168-415