Very likely made by Salvador Ysart during the Ysart Brothers (Vasart) period.
The inner green "ground" is rather unusual in that it looks like a "thick ring" rather than a more obvious green ground within the double millefiori garland that is known in several Salvador Ysart "upright flower / butterfly" weights.
The remains of the label could fit with the round shaped "Vasart" label used before 1956.