Seiko Cal. 6638 - 953

The 6638-953 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6638 caliber with 21j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-bf27e8023e06]

Also known as: Helmet, Crown

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1977

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