1933 Hollow Practical Joke Book -The book is titled; 'A Night In Paris' (illustrated) and the cover is enough to entice many people into sneaking a peak inside at the illustrations.When they do so, they are greeted with a exploding cap that makes a loud pop. The book is hollowed out to conceal a cap detonator that is fastened to the back cover.Directions are on the inside of the back cover.The book was patented in 1933 by the S. S. Adams Co., Asbury Park, N. J.. It was marketed b...y the 'Gokey Co.' of St. Paul, Minn..It measures 7.5 x 5 x 3/4".I don't have any caps.Thanks Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.