Vintage Japanese tea cups

These were purchased by my grandmother in the 50s. Japanese tea cups have no handles so you can tell if the tea is too hot to drink. 14k gold details on fine porcelain, no lead. Never used and absolutely beautiful designed in Paris and made in Japan 5 cups in original box w hallmark stickers. New in box. Even numbers are considered bad luck in Japan so sets are sole in odd numbers. Interesting yes?