I have a 45 to 50 year old riding mower with bycycle steering that has a 4.5 clinton engine,model no.15608400 and serial no.499 0000 010 . The mower blade is 24 inch.The rear end is cast iron, the back metal and the tractor seat is white and the rest of mower is a dark green, small wheels and small half fenders on the front, it is 42 inches long, no decal's or numbers on the mower anywhere, want to know the make and year and what it is worth.It was in a old livery stable in my town and the lady that gave it to me used it to cut the grass in my town when she was a little girl , her dad bought it for her, built like a tank and is all original except exhaust, any info will help