These are supposedly original* German belt loops. Some are marked with an RB.Nr., some are marked with an unreadable maker, and many are unmarked. They are all in usable condition though some are nicer than others, the photos are a good representation of the variation. No choice.
*I say these are "supposedly original" because they are frequently sold as original (like when I bought them) but I am not sold on that idea. They do have a good look and perfect for reenacting.