Unfortunately, these have disappeared from trading floors. Mine is under lock and key.. I sometimes take it or an HP 41 out and place it on my desk just to see the horrified looks on twentysomething’s faces.
I had a small collection of RPN calculators, one or two non-HP, but alas someone broke into my house and took them. I really should have called around to pawn shops after, I’d very much like to have them back.