20 Para Belgrade Printing on cover from Studenica to Raska. Studenica is one of the rarest cancel of classical Serbia.
![[:sr]Савез филателиста Србије - СФС[:en]Union of Philatelists of Serbia - UPS[:]](https://philaserbia.org/wp-content/uploads/2023/05/sfs-logo-02.png){kind=logo}
The letter with the Studenica cancellation