Marraki,

With the larger photo I can see the conection between the "shoe" or whatever it is properly called, that is engaged by the trigger and the second sear. This "intercepting safety" sear is in a different location than others I have seen but its practical aplication seems exactly the same.

the second photo also seems a bit different but not much. Without going back and looking I don't recall a partial thickness lever to the trigger "shoe" on a more modern pattern backlock. Good deep notch...er, bent, however.

Still the function is exactly the same. You should take a look at www.hallowellco.com in the definition section of a backlock and a barlock. I think you will come to the same conclusion.

"Two great peoples seperated by a common language", Churchill?

Best,

JPK