Holster unit marks

I have a converted Reichsrevolver holster exactly the same appearance as the one shown on page 35 of Jan C Still's book on Imperial lugers.

It has no makers name or year but I assume that it is Circa 1910.It is in very good condition.

Inside the flap area it is stamped 2TB.

Would any one know or could suggest is this a makers stamp or a unit mark and if so whom or what? Help please.