If Markus or David North look at the thread they will probably give you an idea as to the maker, if not have a look through the SA makers threads and see if you can see the same eagle
The swastika looks like it is a double strike. Nice buckle.
I'm searching for
special SA/NSKK/NSFK with maker marks
Link to my collection : http://www.warrelics.eu/forum/album.php?albumid=1175