Hi,
Stoich worked in Belgrade in 19th century, apprentice in Austria-Hungary, made up mark with 13 Loth. Obviously he was not familiar with Cyrillic alphabet and placed Latin C at the end of his family name.
In regard of the link given by Krisztián,we have identified at least 3 silversmiths working in Belgrade:Stoich,Bogdanovich and Jovan Nikolich.There was no official guild and they invented and used their marks,more or less fantasy mark incorporating Serbian coat of arms and 13 Loth.
Regards
(Marks on my spoons made or imported by Bogdanovich):
