First it appears Brass and not Copper. The relief art appears pressed and I see no signs of hammered, Base is mass produced machine made. To silverplate a item after it is made is very expensive, because of the cleaning required and for the most part is not worth it, and the only possible silverplate that is left is the lower part of the relief. To have this done would be really expensive, and around the 30's Silverplate was on it way out of popularity. The style of the art would say Art novea period maybe deco, but not sure about Victorian in age. It is a unique item but with the damage, value would be somewhat low, even if it is signed, but that signature looks to be part of the mold and not personnaly engraved.