This is a nice Jules Thonon DR in .405:



See more:

http://www.hunting-heritage.com/blog/index.php/2017/04/10/jules-thonon-double-rifle/

I take it this is in 405 Winchester caliber?
Jim

What a beauty!!
Thanks for posting!
Bob Jurewicz

I had a Thonon sidelock 12ga. Nice gun. Often significantly undervalued, like many of the smaller Belgian makers.