The product is a vintage paperback book titled "Christie's South Kensington 19th and 20th Century Posters," published by Christie's South Kensington in 1995. It includes a collection of vintage posters from the 19th and 20th centuries, showcasing various pieces of art and culture. The book is written in English and serves as a valuable resource for art enthusiasts and collectors interested in exploring the history and design of posters from the specified time periods.