Several years ago, we purchased two set of them at an estate sale.  When we bought them they were sold as McChesney - 123 pattern spurs.  However, we do not believe that McChesney was the maker of these spurs.  We think that they are that they are a unmarked pair of August Buermann spurs.  A friend of ours who is 81 years young, claims that his sister had a pair of spurs like these when he was a kid.  So they date back to the 1940's.