Hi have a large abstract gouache painting by Wilfredo Lam dated 1955. I am not sure what the values of his pieces are worth. It does have providence and other paperwork. But it is a very great piece of art. But any help is appreciated.

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A search of the name reveals many sites about him, along with images of his paintings and the story of his life. Take the painting (or a good picture) along with the provenance (notice that it's not 'providence') to a gallery and ask if they can appraise it and if they are interested in selling it on commission.