Hey Jeff,
This looks like a German carrier, but it lacks the manufactuerer's stamp one would expect to see on a German issue item. The date stamp is clear but the other one is difficult to read, it has roman numerals one would see in BA markings, but that is not what it is. It is possible that it is Bulgarian, but that is just a guess.
Best
Gus
I think the "TD" is for Train Depot. I believe these were workshops similar to the Artillerie Werkstätte. There would be no "normal" manufacturer marks, as the "TD" would have been the manufacturer.
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