I would like to thank everyone for their input.

The qun in question is a 1905 Purdey 12 guage with a serial number of 18561. The gun is being offered by Roger Bain. I have already emailed Purdey with the serial number. Asking price for the gun is $15K. I am already starting to think I should hold out for something original, however, this appears to be a nice gun.

Ken