There seems to be a tendency to sometimes makes inferences about certain markings or characteristics, a la the (U.S.) on some #14 mid-century Lodge skillets being indicative of a US government connection, but with the determination having been made that it was merely an early attempt to adhere to regulations that products be marked as to country of origin. There are some Wagner popover pans marked U.S.N. that have been accepted as being connected to the US Navy, but only because no other explanation as been offered. In this case, I think all that can be conjectured is that a proposed design change may have somehow made its way into production, the best guess being that such a large, heavy skillet may have experienced too many broken off handles, either in production or in use.
What really needs to happen is a comparison of dimensions with a regular BSR #14. If the same diameter, we could more safely assume BSR made it; if slightly smaller (around 3/16"), it would indicate a copy made with an altered BSR pan as a pattern.