Sorry fell asleep ! The oldest tags that I have seen have what looks like stars ( or dots ) behind the name . This one looks like it is from a little later on , but still early . See how the copyright marks are small and underneath Folly . Probably from the mid - late 90's Later on the copyright marks got bigger and are on either side of the logo .
They did not always use enamel on their pieces . However your mermaid has a different look than the "Lorelei " of later years . Very nice find ! You should do well with her , especially since they are no longer available on T.V. People are collecting the pieces on eBay.