I recently saw this gun at The Weston Park gamefair in Staffordshire, England. I'm afraid I can't help you regarding the 54 35 issue but from my discussions with the sellers I'm confident it was actioned by Braziers of Wolverhampton for Alex Henry using the 1865 EC Hodges extractor patent no.3113 under licence. The number 146 is very likely a patent use number. Hope this helps a bit. Hope you are well Justin!

Robert (gt gt grandson of EC Hodges)