Thanks very much to John for finding this Boffo fish ....and for kindly selling it to me !
These are rare and difficult to find. Made by Boffo at Mdina during the 1970's , contains silver chloride. There is some excess glass to one side of the top fin. The first attempt to apply the fin failed and it flopped over to one side, most probably because the glass was too runny. It was saved and sold privately in this condition (probably through a shop popular with tourists ) . It's 20cm tall .