This vase is not marked but seems to me to be either sterling or at least silver plated.
It has a design on front and back as well as some detailed work throughout the entire piece. It stands on 4 legs and it is probably from the Victorian era. It is certainly an original old piece. It has a narrow opening for longer flowers. It is a great center piece. Very unique. Stands 5 1/2" high by 3" wide.