Seiko Cal. 5648 - 340

The 5648-340 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Acrylic crystal and offers 110m of water resistance. [seikata-wm-2d7c9c340ac2]

Also known as: Bellmatic, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

15.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1984

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