Seiko Cal. 4538 - 645

Seiko 4538-645

The 4538-645 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 4538 caliber with 21j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-e8f48b73cf92]

Also known as: Bullhead, Navigator

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
46mm
Case Thickness
10.6mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
120m
Dial Color
Silver
Jewels
21j
Frequency
28,800 bph
Power Reserve
72 hours
Year
1970

Related Models

seikata-wm-e8f48b73cf92