might be a possible German given that these are multi colored frit like yours mate not sure what to make of the solid blue inside,, but the center one in the group pic appears to have some solid to it and i think the base glass has that not real bright and clear look
Not really sure and just really trying to add to the pool of knowledge i figure these were made lots of places like em with the color and that whopper green one is nice
http://www.murmelwelt.de/neue5.html