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
      
Deprez Jean Mathieu
This 
weapon is attributed to Deprez Jean Mathieu de Wandre.
The 
weapon is percussion. Since the hammer is ridgeless, it is likely that the 
weapon will only work by simple action.
It has 
an open frame but the attachment of the barrel to the carcass is special and 
probably stronger than the usual attachments. That is to say that instead of a 
simple screw fixation there is a swivel lock operated by the lever. It is 
applied against the barrel where a small spring-loaded pin engages the notch 
under the barrel and locks it.
The 
weapon has a light engraving, the walnut lacrosse is finely grided and decorated 
with a palmetto.