I can
maybe T. Konierczy
looks like T. (or F.) Kobierczy.
The ending of the surname looks like
-czy indeed.
There is no such surname on the list of Polish artists:
pl.wikipedia.org/wiki/Kategoria:Polscy_malarze
pl.wikipedia.org/w/index.php?title=Kategoria:Polscy_malarze&pagefrom=Jach+Pawe%C5%82+Wies%C5%82aw%0APawe%C5%82+Jach