I bought a 455 yesterday with 470 hrs on it and a 60" deck. It says "COMMERCIAL" across the back of the seat pan in about 2-2.5" block lettering, it looks original to the factory paint. Has anybody heard of this before? It was sitting a few years and was then used sparingly this past summer. It looks like a heluva lawnmower compared to what you can buy for $3000 today. There are 4 hyd. ports in the front of left foot and two in the rear, no steering brakes that I can see, just one large pedal on right above the forward and reverse pads. Any suggestions would be welcome.