EG Webster 1800s Silverplate Reticulated Wine best Coaster Porcelain Insert

best So I am not exactly sure what this is. To me it looks to have been used as a wine or champagne coaster. I have never seen one with a porcelain insert. Maybe a castor set base. The pierced or reticulated sides are very well done and beautiful. It is also adorned by flowers all around the rim. Stands on 4 legs or feet. It is silver plated and in found condition. Tarnished but no damage. The spider web with “W” in the center was used by E.G. Webster & Son. The company made silver plated hollowware. I believe this makers mark indicates that this was produced in the late 1800s. Please do your own research. 7.25 diameter.