Seiko Cal. 6640 - 439

This Hand-Winding model from 1971 features a 37mm Gold-Plated case. Powered by the 6640 caliber with 35j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-fb6394b43e0c]

Also known as: Panda

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

11.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Navy

Jewels

35j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1971

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