Seiko Cal. 6644 - 316

Seiko 6644-316

The 6644-316 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6644 caliber with 18j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-94edfef2cb29]

Also known as: Samurai, Tuna

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
43mm
Case Thickness
8.9mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
90m
Dial Color
Black
Jewels
18j
Frequency
28,800 bph
Power Reserve
51 hours
Year
1978

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