Seiko Cal. 6644 - 767

The 6644-767 is a sought-after Hand-Winding piece from Seiko's golden era. It features a White dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-39fd41fa4959]

Also known as: Sumo, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1979

Related Models

• Seiko 4560-603
• Seiko 7125-675
• Seiko 6144-365
• Seiko 5290-300
• Seiko 6371-306
• Seiko 4592-848
• Seiko 3860-379
• Seiko 5627-864
• Seiko 3833-865
• Seiko 7039-521
• Seiko 4526-388
• Seiko 7114-408