I purchased this at an antique shop in Frankfurt for 10,000 yen. It has a very beautiful tone and is believed to be silver, dating back approximately 100 years. Because it's a metal cup containing silver, it has high thermal conductivity, and you'll burn your fingers if you put hot water in it, haha. As a result, I no longer need it, and I'm selling it at a low price because I'm short on money.