Mysterious Russian bronze (if that, for sale ...)
 

Well , actually, all in the subject header ...
" Curious ," this thing is , of course , first and foremost for me. Specialists believe right now, all told. Like, all the letters of the author's name is quite readable, although the options have different interpretations . Something like " Lyufferd ", but such is nowhere found ( by the way, here is where the photo caption is better than life ). Search by name immediately gives " Sculpture of Radziwill the Orphan " and nothing more ...
My own views on the part of the search for truth in this exhausted.

Height -26cm , weight decent ...

In the first photo title sculpture "Orphan"

the second name of the sculptor P.Kyufferle (Peter Osipovich Kyufferle)
 
and foundry mark, hard to see, but it seems Carl Rossini?

Yes, there's your " Lyufferd " ... [ puzzled scratching his head ]
Honestly, have not heard about this before !
Now look : Pietro Kyufferle , a Russified Italian , lived in St. Petersburg. Translated into Italian poem Block and Vyacheslav Ivanov , the field of sculpture was marked mostly - Manufacturing of monuments and tombstones.
But any Lancer and Grachev known in hundreds of casts, such as " orphans ", it seems , no one has never seen ... Rarity !

clearly and unambiguously read - P.
Kyufferle , see for yourself at the picture.