Seiko Cal. 6631 - 616

This Hand-Winding model from 1969 features a 44mm Two-Tone case. It features a Navy dial protected by a Mineral crystal and offers 80m of water resistance. [seikata-wm-65ce5a5da70a]

Also known as: Silverwave, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

14.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1969

Related Models

• Seiko 3876-977
• Seiko 6114-795
• Seiko 6687-630
• Seiko 5244-792
• Seiko 0746-913
• Seiko 7117-746
• Seiko 6288-511
• Seiko 5635-240
• Seiko 3843-854
• Seiko 4548-305
• Seiko 4421-512
• Seiko 6330-247