Started work on a new stock gun today, a 12b RUL Hammergun by A Maloch of Stirling and found a very rare rebounding lock mechanism inside. Patented by Stanton 2 years after his commonly found patent, I have never seen an example of it before. The spring would be a nightmare to make so thank goodness everything is nice and shiny inside!
Plus it has a rare Loaded Indicator mechanism, very reminiscent of the Dickson round action's gold washed pins. The left pin on this has been broken but it should be easy to rebuild with a little TIG magic!
Lovely classic, early engraving.