Seiko Cal. 6331 - 366

The Seiko 6331-366 represents an important milestone in Seiko's 1965 lineup. Powered by the 6331 caliber with 29j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-5d283e619fec]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

8.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1965

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