Unbelievably rare. Research failed to reveal any others for sale, not even a photo on the net. The total cost of a book of 6 at the time was One Shilling & Six Pence which meant a single journey cost approx 2 & 1/2 Pence. The tickets measure 8.6cms x 3.9cms. They are in average condition, but so rare. No history is known about the item.