hello Lino,
In my database, the Werkenummer between nr.2471 and 2493 have no known Stammkennzeichen. It is most interesting to know whether your partial Stammkennzeichen T_+ZH or _T+ZH could solve us to fill in a missing gap in our knowledge.
Just a thought: could it have been 248
3 ? If 2470 = DI+LU, 2475 could have been DI+LZ, 2476 starting with _T+ZA (or T_+ZA) and 2483 therefore _T+ZH (or T_+ZA)
Just some quessing and assuming that the DI+Lx Stammkennzeichen range did end with DU+LZ
Best wishes, Marcel
www.fliegerhorst-venlo.net