A picture of what you have would help, otherwise we are not mind readers you know able to diagnose or give a quick estimate on a print, oil painting, watercolour or any other artform. Even with a pic, would be hard. Suggest you have it appraised by an art dealer to have a very accurate appraisal, whereby the art appraisor can give you a documented quotation on the value. Otherwise offering it up for auction would not work as you could not authenicate the value from a reliable source who could see, feel it otherwise take a good look at it.
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