I don't think the gold buckle is anything more than one that has lost most of it's silver finish. It does look interesting but I bought it because it was a bargain.
Here is a variant catch. I think will find a variant RAD with the same construction.
nice buckle .
Think that the light metall production from Overhoff .
I hold also a light metall variation but from Dr.Franke & Co. :
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 picked up top-left Luft buckle sometime back mainly for the similar variant catch.