Are signed Harold Altman lithographs valuable?

Signed Harold Altman lithographs can be quite valuable, depending on factors such as the artwork's rarity, condition, and demand among collectors. Altman, known for his impressionistic style and depictions of landscapes and figures, has a dedicated following, which can enhance the market value of his signed works. To determine the specific value of a lithograph, it's advisable to consult recent auction results or seek the opinion of an art appraiser.