Antique Silver Holy Water Font

One of the loveliest pieces I bought from the Arezzo Antiques Fair.

This is an antique silver Holy water font with Santa Theresa picture. Is the picture hand painted? I am not sure. Is this holy-water-font Italian? I hope so. My hubby says it maybe French. There are two hallmarks at the inside bowl, but they are worn off. One of the hallmarks has letter B. I still do not know how old this piece is and where it is from.