Seiko Cal. 4420 - 310

The 4420-310 is a sought-after Solar piece from Seiko's golden era. Powered by the 4420 caliber with 25j jewels beating at 36,000 bph, it delivers a 69 hours power reserve. [seikata-wm-0895df66420f]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

8.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

25j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1997

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