Pop into any antique store in the country and you’ll likely find at least one porcelain doll sitting on a shelf (probably next to the vintage figurines). But how much are these delicate dolls worth?

A dear friend recently gave me a boxed set of eight little figurines. Each figurine is 3½ inches tall as well as numbered and marked “Made in Japan” and “Japan” on the base. None of them is broken or ...