HP-65 removing label - any advice is welcome

[AndiGer]

See an old thread using heptane (you can search the hpmuseum site for "un-do" as well) which you can't buy here in Germany due to safety reasons.
See post #4: if your only intention is to get inside the calculator it is suggested don't remove the whole label.
https://www.hpmuseum.org/cgi-sys/cgiwrap...ead=104379
I also find it reasonable not to re-screw the two screws underneath the label.