Best bet is to check the auction sites for one in similar shape/condition to yours. Your description is to vague. Also, the original box, manual, and any other papers that came with it will add value. Ball park would be 50-150.
10-150 USD or so
About $450.00 USdollars.
50-100
50-100
10-250 USD or so
i saw where one sold online for 259.00
10-125 USD or so
AROUND $300, depending on which model and condition.
250 - 350 depending on precise condition
Made in 1956. Value will depend on condition- somewhere around $175
25-150 USD or so
i have had a few of the sport kings i could not push them for no more than 150.00