Decal says: CERTIFIED OLIVER CORPORATION CERTIFIES THAT THIS TRACTOR SERIAL NO._______________ WILL PRODUCE AT APPROXIMATELY 1000 FEET ALTITUDE ABOVE SEA LEVEL WHEN NORMAL BAROMETER AND 70 DEGREE TEMPERATURE PRE- VAILS AND WHEN ENGINE IS TUNED COR- RECTLY AND BROKEN IN ADEQUATELY, AT LEAST ___ OBSERVED P.T.O. HORSEPOWER ________ INSPECTOR