Seiko Cal. 6644 - 257

The 6644-257 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-5d0e30bdca01]

Also known as: Silverwave, World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

10.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Green

Jewels

18j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1973

Related Models

• Seiko 5285-890
• Seiko 0757-868
• Seiko 6375-120
• Seiko 5258-410
• Seiko 3890-949
• Seiko 6660-783
• Seiko 5239-775
• Seiko 6224-429
• Seiko 6232-483
• Seiko 4452-367
• Seiko 5693-353
• Seiko 6678-647