Seiko Cal. 4487 - 238

The 4487-238 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4487 caliber with 18j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-4c293fa95b8a]

Also known as: Sportsmatic, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

13.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1973

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