Seiko 8420 Movement Details

Seiko caliber 8420 is a high grade analog quartz watch movement. Production was in the 1980s.
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Sub-brands: Exceline, Credor, Lassale
Battery:SR616SW / 321 (Silver oxide)
Accuracy:±15 seconds/month
Day / date?No
GMT / world time?No
Rate:32,768 Hz
Number of jewels:6
Size / diameter:14.9mm
Development division:Daini (Kameido, Tokyo, Japan),Suwa (Nagano Prefecture, Japan)
PDF guides: Technical guide : 8420A

Part Codes

Stem code: 354815