Seiko Cal. 5240 - 987

The Seiko 5240-987 represents an important milestone in Seiko's 1974 lineup. It features a Cream dial protected by a Mineral crystal and offers 130m of water resistance. [seikata-wm-b4194d893238]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Cream

Jewels

17j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1974

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