Long-term home storage item. Due to the degree of aging (change) and weight, I suspect it's silver-plated or nickel silver, but I can't say for sure. There are no markings or stamps whatsoever. I think the inside is gold-plated, but I can't confirm this either. Since it says "Paipan-so," I believe it's a mahjong trophy. The case is tattered from age, but I think it's rare to have the case included. The trophy weighs 90g. It's about 14.5cm long.