- Authenticity: Ensure that the picture is authentic and not a reproduction. Verify the signatures by comparing them to known examples of Roddy McDowell's and Kim Hunter's signatures. Look for certificates of authenticity or provenance from reputable sources.
- Condition: Consider the condition of the picture. If it is well-preserved and free of significant damage or deterioration, its value will be higher. Look for any creases, tears, stains, or fading that could affect its overall appearance.
- Rarity: Assess the rarity of the picture. If it is a limited edition or a unique piece, its value may be higher. The availability of similar autographed pictures from that specific era and their market demand can influence its rarity.
- Provenance: If the picture has a documented provenance or ownership history, it can add to its value. For instance, if it was previously owned by a famous collector or celebrity, its provenance can make it more desirable.
- Market Demand: The market demand for autographed Planet of the Apes memorabilia, particularly from actors who played prominent roles in the franchise, can impact the value. If there is a strong interest among collectors for Roddy McDowell and Kim Hunter-signed items, the value of the picture may increase.
It's always advisable to consult with reputable experts or appraisers who specialize in movie memorabilia to obtain a more accurate valuation of the autographed picture. They can consider all the above factors and provide a professional assessment of its value based on current market conditions.