I may not have the best eyes but check out the charger bridge on the pic with the RHS of the wrist in view; at the top I can see 4 little crescents that could most certainly be the bottom of a "JJCO" stamp, and it even looks like the same font as my rifle with this mark, and then under that is "NY, NJ .303". If I remember right that is where John Jovinco did the deed with these US living Australianicon born Lithgows.