Hi Paul,
the one i sold and the one i found on ebay a few months ago, pics below,
both had ill fitting loose stoppers, i think they are purely decorative items.
This one, is not of the same qulity as the other, which was nicely cut, although the
enamelling seems to be of a 'naieve' style.
This coating on this one is a very very thin coating of glass ,paint or enamel, i think its painted on,
maybe its similar to the blue coating on yours??
Doesnt appeal to me, but only paid a few pounds!
Cheers
Andy