This is a phantom lucky cup that was included in Maruha Nichiro's shrimp and cheese gratin. It's a rare cup, with some saying the probability of finding one is 1 in 100 million. How about adding it to your collection? I have washed it with detergent, but there are oil stains on the back. Please refrain from purchasing if you are sensitive to this. [Brand] Maruha Nichiro [Category] Phantom Lucky Cup [Color] Gold系 (Gold-toned) [Material] Paper Thank you.