Seiko Cal. 4577 - 637

The Seiko 4577-637 represents an important milestone in Seiko's 1970 lineup. Powered by the 4577 caliber with 19j jewels beating at 36,000 bph, it delivers a 69 hours power reserve. [seikata-wm-192e7b41734b]

Also known as: Goldfeather, World Timer

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

13.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Green

Jewels

19j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1970

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