This is a 1928 limited edition illustration by French artist Robert Polack from Voltaire's book Candide. This reproductive image was done by skilled artisans is a process of watercolor then attached to a page in the book. This Art Deco technique called Pochoir was a way of making high quality reproductions available through publishing. Signature lower left  Illustration measures 6X7"on 7X9". The use of  bright colors and silver paint are still vibrant after nearly a century, in excellent condition and ready to frame.