Thank you for submitting your item for appraisal. This is unfortunately only an offset reproduction print after an Audubon engraving. Audubon has always been very popular in the United States, but in the late 1960s his engravings became even more popular and to meet the demand his engravings were produced as offset prints on a large scale. Using a magnifying glass you will notice the small dots of the printing grid. The estimate is based on similar faded offset prints offered or sold at auction.