If it came with a belly mower and had hydraulics, may-be $1500. No mower and no hydraulics it"s not worth half that, unless you just want to look at it.
A friend bought a 49 cub for $800 with 5 implements, no belly mower. He thought he was going to make out big on the deal. Took him a year to find a buyer. Don"t think he made a large profit.
I think there aren"t that many people wanting an old small tractor anymore. Besides what can you do with a one bottom plow?