This is a George V1 Coronation celluloid book mark in red, white and blue. George came to the throne in 1936 until his death in 1952. The book mark is in good condition for the age and measures approx. 3 1/2 inches x just over 1/2 inch. I am not finding these celluloid items so easy to find now. Ref: 3188 D10/53