I was recently gifted a 16 GA SxS and have been trying to identify its manufacturer and date. After some internet research I believe it is likely either a French or Belgian manufacturer (I'm guessing Mode a Paris). Based on the ELG proof, perron and(crown and star below the ELG) it appears to have been manufactured between 1893-1924. There is a greek beta symbol on the breech which according to one listing indicates it was manufactured in 1923. Also on the breech is an S with a star over it. The choke is 16.9/17.1. The only other markings are on the barrels, one says simply "Chevalier" and a marking on the other barrel says, "a Paris". I have pics but for some reason I can't attach them in this post.

Any help?