Wow! One of the most difficult questions to answer. I see from the model number is a horizontal motor drive which is generally thought to be less valuable than the under-mount drive. But from there so much of its value depends on what condition it's in: Is the bed worn, is the spindle worn beyond adjustment, do the spindle and tailstock centers line up, are the cross feed and compound feed screws worn, has the carriage been bashed against a rotating chuck, is the quick change gearbox worn, and so forth.
If you don't have much experience with these machines you'd be well-advised to find somebody who is experienced and get them to help you evaluate the machine.
Lacking any additional information or good quality pictures, I'd put the value at someplace between $500 and $1500 -- again depending on condition.