If I am not mistaken, I either found the Herring catalog online, or through the library Worldcat? loan system. It is entirely possible the box is an earlier Herring, but not the 1866 vintage. Also there would have been many makers of similar strong boxes in the mid 1800's. As well there were many keylocks that had big levers like that one. And Herring didn't always make ever lock they used on their safes. I believe the first screw cutting lathe dates back to the 1820's, but not positive on that. When I lathe cut screws, I often use a hack saw to cut the slot. Sometimes the slot looks perfect, sometimes not. So that doesn't help much. It is the overall design of the lock and how it was made that puts it in the early middle or mid 1800's, and not early or late in the century.