Bert (avandonk) has done it again and sent me a rather historic calculator for my HP Calulator Museum - the original (i.e. very first) handheld calculator - and it utilised RPN from the outset.
I'd really like to thank Bert for allowing me to restore to working order a significant piece of electronics history which is nearly 37 years old.
Cheers Bert
and thank you
Restored and original: