Seiko Cal. 7142 - 509

The 7142-509 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7142 caliber with 21j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-d756f13a9fd8]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

9.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Silver

Jewels

21j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1978

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