Hungarian Postal Label Used On 1924. Postcard

Hello Everyone,

I am treating this subject as postal history, hence I am posting it here.
This postcard has been used within Hungary in 1924 and it has appropriate 1000Kr posage stamp. The label in lower left corner is something I havent seen before and I am wondering if it is postal and if it is original to the period or it has been added later for some reason.
Can anyone share some info on this label.
Thanks!

KRT
Acronym of Körút = Route

Thank you jorgesurci.
In case it was a indeed acronym, why would they use fullstops.

Well. it seems I was wrong.
The acronym KRT actually is abbreviation of "körút" wich means route, tour, boulevard.
But this is written in the address, just as AV is acronym of Avenue or ST acronym of Street.
K.R.T. with fullstops is something else that I don't know