Seiko Cal. 5648 - 361

The Seiko 5648-361 represents an important milestone in Seiko's 1974 lineup. Powered by the 5648 caliber with 24j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-76bd9fc2508b]

Also known as: Tuna, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Navy

Jewels

24j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1974

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