My dad says he's never replaced the battery in it. We saw this in a home video and laughed when we found the still uses it 40 years later.
For testing:
this post was submitted on 31 Dec 2024
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Here's the manual: https://www.manualslib.com/manual/3403927/Casio-Checkbook-Cb-100.html
That's awesome! I'm sending this to my Dad.