Vintage Garrett 2000 RPN Space Age Faux Wood Desktop Electric Calculator Tested. This super cool calculator features faux wood paneling on either side and bright colored keys. Garrett 2000 model uses Reverse Polish Notation (RPN) for calculations. Instructions are on the back of the calculator. Corded electric with toggle switch for off and on. Tested and in working condition. Keys stick a little. Please see pictures for more details.