Seiko Cal. 5240 - 945

The Seiko 5240-945 represents an important milestone in Seiko's 1968 lineup. The Inner Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-1092b9dfa9ac]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1968

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