Hi,
Most likely
Ljubljana Slovenia (Laibach)
There is a controversy here:the mark of 1806 had letter L (probably for Laibach) then in 1807 letter K was assigned to Ljubljana (letter L was for Trieste,Italy).
Shield with eagle, letter L below, 13 above and date 1806 (eagle in the mark perfectly matching yours).
Regards
![Image](https://abload.de/img/077zekkm.jpg)