The Crosman model 788 BB Scout was made between 1978-90 depending on the variation. You need to state the current working condition of the rifle to get an estimate of value.
Which model Daisy are you asking about, and what is the condition of the BB gun?
Excellent. Very Good, Good, Fair or Poor? This information is needed to answer your question.
You have given no description of the condition of the rifle so I can't give you an estimate of value. So I'm going to post a link at the bottom of this page for you to ask "Daisy Antique" the same...