Seiko S501 Movement Details

Seiko caliber S501 is a digital watch movement. Production was in the 1980s.
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Battery:BR2325 / (Lithium)
Accuracy:±15 seconds/month
Day / date?Day + date
Development division:Suwa (Nagano Prefecture, Japan)
Notes:Has a memo function. Referred to as a "wrist terminal", watches with this movement came with cables and software to transfer data to a computer.
PDF guides: Battery replacement guide