Seiko Cal. 4470 - 740

The 4470-740 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4470 caliber with 25j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-1b0259ab6e67]

Also known as: Tuna, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1974

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