For Sale: APF 55 Non-HP RPN for your collection

[Matt Agajanian]

Thanks for the offer. Bought one years ago from TAS. It’s a fantastic clone of the Corvus 500.

I do have a major question, though. It looks like the battery is sealed up in the calc (i.e. you can't use a coin to open the battery compartment or just pry up a bottom slit). So, how does the battery get replaced if it's either oxidized or so old it cannot retain a charge?