I've heard that the single trigger models were being sold by The Sportsmen's Guide for $99, but I haven't verified that. They were probably sold on closeout .
The last 2 numbers of the serial number usually indicates the date it was made.
Is it a St. Louis Hawken with a double trigger or the single trigger? The double trigger model is a kit gun and is currently listed on their website as having a list price of $249.
The used value always depends on the condition of the gun and specific details about which model it is.
Because its been drilled and tapped for the scope, that might detract from its value, but at least the scope has some value.
How much did you pay?