whose uniform is this? its from Napoleonic times, Austrian?

May we see the back? These are often little recent decorative imports.

Debora

 

Portrait of Joseph Bonaparte, King of Spain
Portrait of Joseph Bonaparte, King of Spain (philamuseum.org)

 

There are tons of these floating about. They're charming but I suspect not very old (although sellers often attribute them to the 19th century.) I believe that most are bone, not ivory, but someone may know better than I.

Debora

 

There are several threads here about items framed like that. Afantiques was especially good at informing us about them. Here is a thread in which I commented and included links to several other threads here.
https://www.antiquers.com/threads/french-miniature-or-fake.35223/#post-509065