It will depend on the overall condition, if it is in excellent shape then I'd expect it to bring more than one that has been left out in the weather and things of this nature....a collector would be your best bet if it is in great shape.....I would expect from $200.00 to as much as $1000.00 Just my opinion ...
One in minty collector condition can fetch $800-1000 with excellent mower deck. Average running condition likely $300-400. Good condition with a good working mower deck maybe $500.