I'm not quite sure just what this is. I really can't see what the marking actually is - so there tis a bit of a mystery there. From what very little I can see it doesn't look TR - but does not really seem correct for the Imperial era either. So Weimar? Foreign contract? With a personalization?
Attached - the stamping on the pommel cap of a Kriegsmodell IOD 89 (f�r Unteroffizier mit Portepee).
FP