I have the exact same bowl (found with Google image search).
It was labeled "silver" when I bought it, but I had to remove the tag to test it so I couldn't bring it back to the thrift store from which I purchased it.
The bowl is plated to the best of my knowledge. Since the inside was damaged, I took a butter knife and scratched across one of the damaged sections and found a fairly soft, bright silver metal. I think it may be silver plated pewter since it is becomes mailable with a soldering iron, but won't liquify like lead. The under metal also turns black with acid (I used a strong vinegar and some hot sauce to get the strongest home-made acid base I could--the silver plate did NOT react, but the under metal was obviously black after a few minutes).
The bowl itself is beautiful, but I don't know if it's worth anything. I believe it is NOT vintage or antique due to the glazing which was used on its surface.
http://t3.gstatic.com/images?q=tbn:ANd9 ... BhSXAMKGKg" onclick="window.open(this.href);return false; (this is a cut and paste of the previous post. I don't have a picture of my bowl, but the design is EXACT.)
If anyone learns any more about the hallmark or the bowl itself, please post!
--RG
Ignore the following. It's just to help others looking for info on the same unidentified hallmark.
Lion Shield Lion. A shield between two lion heads. lions' heads. between two lion's heads. Mystery hallmark. Plated silver.
