Seiko Cal. 5240 - 720

The Seiko 5240-720 represents an important milestone in Seiko's 1972 lineup. Powered by the 5240 caliber with 18j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-aeb1408e08a5]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

13.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Black

Jewels

18j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1972

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