According to Purdey records their first hammerless gun was number 10106 and tested on 26th. September 1877. Action type not recorded but may have been on a Gibbs and Pitt action. As they left the 314 1/2 Oxford St. address that same year I would be doubtful as to its authenticity without contacting Purdeys. I have only ever seen hammer action emanating from that premises. Lagopus.....