Originally Posted by
h2oxtc
Now THATS a real calculator (RPN)! I don't recognize the model though. I'm assuming it's an HP, of which I've had many over the years. Sadly, recent models have not been made nearly to the same quality as those through the 80's.
Here's an image of my first.

Sweet! The HP-45.
That one up there is the HP-41. It has the Math and Home Management Packs, and the Quad Memory. I had an HP-25 too.
I spent many an evening drylabbing with that thing. Just me, a cup of coffee, and my HP calculator.