I believe the British patent number for the Westley Richard's toplever is #1572 of 1871. Your GR would have been manufactured a bit after that. Here's a similar Westley Richards 12 bore listed for 1150(pounds sterling): http://www.ariantrading.com/featured/12b...otgun-ref-a966/







I'm not sure if that crab-joint has a patent or not.

Kind Regards,

Raimey
rse