It is a Lefaucheux action made prior to 1877 (the inspector's marks are crowned rather than spangled) with a bore of 17.4 mm = .685".
The barrels are a lower grade Bernard pattern.

'EW' could be the barrel maker or gun maker; possibly one of the Warnants. Emile used 'EW' but he was much later
http://www.littlegun.be/arme%20belge/artisans%20identifies%20t%20w/a%20warnant%20famille%20gb.htm

Ernest Wilmart was also much later
http://www.littlegun.be/arme%20belge/artisans%20identifies%20t%20w/a%20wilmart%20gb.htm