Seiko Cal. 4521 - 358

Seiko 4521-358

The 4521-358 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4521 caliber with 21j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-c4ecb4dcf5ca]

Also known as: Monster, Tuna

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
43mm
Case Thickness
12.8mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
170m
Dial Color
Blue Sunburst
Jewels
21j
Frequency
21,600 bph
Power Reserve
56 hours
Year
1966

Related Models

seikata-wm-c4ecb4dcf5ca