What is the value of a norman rockwell lithograph a serious case signed right lower corner in block red left lower corner GP208 li tho in usa co?

The value of a Norman Rockwell lithograph, such as "A Serious Case," can vary significantly based on factors like its condition, edition, and market demand. Generally, signed lithographs can fetch anywhere from a few hundred to several thousand dollars at auction. To get a more accurate appraisal, it's advisable to consult a reputable art dealer or auction house specializing in Rockwell's work. Additionally, online platforms or galleries that focus on American art may provide further insights into current market values.