I just got these in the mail today.
Two are all black and the others are black on one side and the other side brown.
One of the black/brown ones is marked TOLLA WIEN inside an oval.The others are unmarked.

Comments are welcome.

Ulf.

Brave Wolf, for sure it is "STOLLA WIEN" which is a for me well known austrian leather goods manufacturer for the 3R period and lateron. Congratulations.

Great little items-you just NEVER see these.

Thanks Wotan and Houston.Stolla Wien it is.The S probably is hiding under the rivet.

Ulf.