Doug, that is an interesting contrast to what I have been told. My employer always described these as salesman samples, and he has been in the trade for nearly 60 years. I am in no position to take sides, but would like to know more. I have one myself, and have restored a few others. Two of them are probably from the same mold as this example. Mine has the original lock. A S&G with a two wheel changeable combination by means of perforated wheels and moveable stops. The fence lever is spring loaded. If anyone does know the maker, chime in!