A number of years ago I aquired a “Thumb O Graph” dating back to 1905, from a close friend of the family. I have searched many sites and have been unable to find out anything about it other than the first one was introduced in about 1904. For those who are unfamiliar a “Thumb O Graph” is a book with an ink pad used much as our teenage years autograph books, only the person would sign their name and add their thumbprint beside it. If anyone has any information it would be greatly appreciated. The book I have is in good condition with the ink pad and about 15 signature/thumbprints dating from 1905-1907.