Karabinerriemen dated 1928 K98b?

Would like to hear your opinions about that sling.
It seems exactly like a K98/K98A sling, but it is 8cm longer. Not stretched. Width and thickness is according to regulations.
Any other slings with a length of about 144 cm out there?
Thanks

Since it's not stretched, just a little over 3 inches longer than a K98a sling, & with that date, most likely it's a K98b sling. Nice, rare sling.

Thanks!
I also believe that it is a sling for the K98b, but I haven'f found any period document about a K98b sling yet.