I decided to find a split sling to replace the Yugoslav sling on my M53 and after some searching and comparing what was available to me, I ended up acquiring what Bergflak identifies as:
Description, Strap: The strap is 1" wide and the overall length of the sling is just under 29". The grips are padded with something...This is a Spanish postwar MG42/MG3 sling. Good resemblance, but has a special front buckle with a washer. Rear buckle has no spacer ring but is wider all over. Grip handles have padding.
Description, Buckles: The rear buckle appears to be a single piece casting. The front buckle has a washer that the carabiner seems to be formed around (as opposed to being welded or brazed together), while on my sling the carabiner is installed backwards, from the way it is on the German buckles (in relation to the flap around the ends of the sling). Note that in Bergflaks example, BOTH buckles seem to be to the wrong orientation, in relation to the end-flaps.
Markings: The front buckle is stamped with what could be either "FAUERS" or "FADERS". No other markings or proofs to be found.
I must say, "split sling technology" is much superior to "non-split sling technology" when it comes to carrying the MG42! Now the gun is actually balanced in your hand, when using the sling as a carry handle. The gun is so unwieldly when using the non-split sling.
As well, the narrower wire buckles on the front also don't get caught in the bipod to the same extent that the wider Yugoslav buckles do.