Looks good & even better that all the pins are indexed and unbuggered.
Your EW may be Emile Warnant of Liege, did not check the relevant dates against your Proof Marks. There is also the Thonon family who may have been barrel makers.
You will find both of these here : - http://www.littlegun.be/arme%20belge/a%20a%20artisans%20identifies%20gb.htm