Seiko Cal. 4537 - 644

Seiko 4537-644

The Seiko 4537-644 represents an important milestone in Seiko's 1983 lineup. Powered by the 4537 caliber with 22j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-2b34a00c6d17]

Also known as: Helmet

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
41mm
Case Thickness
12.2mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
40m
Dial Color
Green
Jewels
22j
Frequency
36,000 bph
Power Reserve
37 hours
Year
1983

Related Models

seikata-wm-2b34a00c6d17