Seiko Cal. 6631 - 757

The 6631-757 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-42d2bc87ff2d]

Also known as: Samurai, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

45mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1977

Related Models

• Seiko 0722-534
• Seiko 6172-172
• Seiko 6645-401
• Seiko 7026-768
• Seiko 5263-225
• Seiko 4559-727
• Seiko 0772-112
• Seiko 7126-349
• Seiko 4464-580
• Seiko 6364-103
• Seiko 4481-355
• Seiko 5675-648