I was wondering if anyone could identify and date this ejector/easy opener system? It is on a J.P. Clabrough and Bros., serial # 10,283. It is a bit like the Holland & Holland self opener with the spring in the housing attached to the barrels, but that was patented in 1922. The action springs open when cocked, but is manual when either or both barrels have been fired. Sorry for the bad pictures and thanks in advance.