PeteM's list of maker's marks does not have a Crown over LJ (?). He lists Baltus-Wilmonte for 'BW'
You could chalk or wax pen the marks to be sure.
Interestingly, marks under a 5 point crown are usually French, though obviously the other marks are Belgian. I checked the LittleGun site under both French and Belgian makers and didn't find any matches.
You might spend some time looking around the links here
http://www.shotgunworld.com/bbs/viewtopic.php?f=5&t=295608

https://sites.google.com/a/damascusknowledge.com/www/home