Seiko Cal. 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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