Hi, all.   I'm currently jointly writing a play for submission to BBC Radio based on Charlie Hudson's 1913 achievement in winning the long-distance pigeon race from Rome.   Research is always a pain, but it's a necessary evil. I'm working from a number of documents, primarily David Glover's 'Pigeon Racing', but I've come across a question not covered in the book (there may well be more in future weeks). So, I thought I'd address it to a group of enthusiasts. That'll be you.   When was wing stamping introduced?