Seiko Cal. 4420 - 520

Seiko 4420-520

The 4420-520 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4420 caliber with 23j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-c48df5d3d576]

Also known as: Baby Tuna, Emperor

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
41mm
Case Thickness
15.7mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
30m
Dial Color
Navy
Jewels
23j
Frequency
36,000 bph
Power Reserve
45 hours
Year
1975

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seikata-wm-c48df5d3d576