post WW2 many small items were made in japan to help them get back on their feet * much of it was small export type goods -- the early ones were marked occupied japan --later on in the 50's and early 60's it was just "japan" --i'd guess those were most likely 50's or early 60's era --that's my "best guess"
Probably worth under ten dollars, unless they are gold and genuine gemstones. Unfortunately there is not a huge demand and there are a lot of them out there.