Interesting mark, please help me identify it

Hello! Newbie here! I just bought this vase at an Estate sale, My research has led me to believe it is a Legras Mont Joye piece. The unsual thing (or so it seems) is the marking at the base. *See pics, I am looking for answers on what the embossed marking is and....if this is a Legras Mont Joye piece. Also......what do you think it's worth? Thank you!