Here's the patent #1618247 of 1927 for the rear underlever breeching device:

http://www.google.com/patents?id=AX5KAAA...;q=&f=false

As well here looks to be a previous version under patent number #1562501 of 1925 which show's a modified Purdey nose:

http://www.google.com/patents?id=8TJPAAA...;q=&f=false



Kind Regards,

Raimey
rse