There was a specific label used from 1901 to 1911; paper 4 1/2" X 3". Just checked Peter Dyson https://www.peterdyson.co.uk/acatalog/TRADE_LABELS.html He has them either side of that date listed but may be able to help. Failing this try Henry Krank http://www.henrykrank.com/index.php?main...=20a&page=2 Otherwise take a try with Purdey's themselves; you never know. Lagopus.....