Hello jeeplover, to my best knowledge these hangers have been patented SA dagger hangers. With decades of time and shoe polish the brown color sometimes turned to a brownblack color. It is also possible that some of these have been worn, during the period, as SSdagger hangers, therefore perhaps privately colored black.
Btw your hanger misses an important loop (see mine).
These hangers now are often faked and offered even by the "big ones"... Your hanger seems to be a nice original which are scarce at least.
Here is a pic of mine and one variation how it was worn .
Regards,

patenthanger_a.JPG (99.79 KB, 300 downloads)
patenthanger_b.JPG (102.28 KB, 299 downloads)
patenthanger_c.JPG (25.4 KB, 296 downloads)

wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.