Hello, and thank you for your question.
Is your print hand signed? Numbered?
Prints such as that you describe were made after the original numbered editions and are considered lithography that is "between" that of the original editions and mere knock-off prints and posters. It is of higher quality and probably dates to about the 1980's or so. As such, in excellent condition, it would have an estimated value in the range of $300-$500 (unframed - framed).
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Thank you, again.