Instructions
Look for sake sets that were created as souvenirs for a special event or location in Japan. Sets that tie in with high profile events usually increase in value.
Pick sets that are clearly marked on the bottom as being made in Japan. You may find sets from different countries, but the Japanese sake sets possess greater value than sets made elsewhere.
Check the bottom of antique sets for small bumps in a circular pattern. This indicates that the set dates back to the 1800s, when the makers used metal holders to keep the pieces in place when they were fired.
Invest in Japanese sake sets made of pottery. Modern sets are usually made of porcelain, but older sets were usually made of a ceramic material.
Find sets that are dated on the bottom, as they're worth more than modern sets.
Visit flea markets in Japan or in areas with a high concentration of Japanese immigrants to find sake sets that are older but still in good condition.