Seiko Cal. 4498 - 635

The 4498-635 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4498 caliber with 28j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-280bb23dcb3b]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

10.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Navy

Jewels

28j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1966

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