Bought a second hand book on the GWR broad gauge at the weekend. Imagine my surprise when this fell out. Can anyone tell me more about it? Can anyone read this handwriting? There's nothing written on the back. I assume it's authentic, the paper feels old, and I've no idea why someone would make a replica then age it so thoroughly. Inevitably, I'm curious as to if it is worth something, though I doubt I'll be retiring on it.