sorry but is a 100% fake.
Three holes to solder are a absolutely no go !
Also the prongs are typikal fake ......
I'm searching for
special SA/NSKK/NSFK with maker marks
Link to my collection : http://www.warrelics.eu/forum/album.php?albumid=1175
I agree with Markus, the buckle is a fake, three solder points bad box bad prongs
Ok Ben i understand