Seiko Cal. 4498 - 635

Seiko 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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