Seiko 8420 Movement Details

Seiko caliber 8420 is a high grade analog quartz watch movement produced in the 1980s.

Sub-brands: Exceline, Credor, Lassale
Battery:SR616SW / 321 (Silver oxide)
Accuracy:±15 seconds/month
Day / date?No
GMT / world time?No
Chronograph?No
Rate:32,768 Hz
Number of jewels:6
Size / diameter:14.9mm
Height:1.7mm
Stem code: 354815
Development division:Daini (Kameido, Tokyo),Suwa (Nagano)
PDF guides: Technical guide for 8420A