Some of the most beautiful work of this craftsman, and many others, are in this book “Liège Gunmakers through their Work. 1800 - 1950”.
For more detail see: LIEGE GUNMAKERS
      
Rissack Jean-Jacques
Here is a very interesting percussion revolver from 
the prolific Liège gunsmith 
Jean-Jacques Rissack, 
already extensively mentioned on the site.
That said, this revolver is in fact the culmination 
and concretization/combination of four patents, ranging from the internal hammer 
to the rod, filed between 1847 and 1853, among the twenty patents filed by
Jean-Jacques Rissack.
It 
should also be noted that the grips is one piece.
The 
punches are classic: ELG on oval star, accepted between 1846 and 1893, and V 
crowned, countermark of a controller between 1853 (?) and 1877.
GP with 
the help of HPH.