Are cast iron door stops valuable?

To tell if a cast iron doorstop is valuable, always look for original paint. Any that have been repainted or repaired will have diminished in value. You can also use online resources to try and research items, but the best way to find out if a cast iron doorstop is worth anything is to consult a certified appraiser. An experienced professional can evaluate the condition, determine the maker and research the piece to assign an approximate value. On 1stDibs, find a range of doorstops.