Seiko Cal. 5640 - 248

This Spring Drive model from 1969 features a 38mm Hardlex-Coated Steel case. Powered by the 5640 caliber with 25j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-c91154533be4]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

9.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

130m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1969

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