Seiko Cal. 5240 - 810

The Seiko 5240-810 represents an important milestone in Seiko's 1975 lineup. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-86fc73e6cbc2]

Also known as: Bellmatic, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1975

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