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Jade Green Plastic Demonstrator - These items were used to show how the pens worked. They originally had an ink sac but were not fitted with nibs or feeds. The six holes are punched through rather than drilled. The top hole shows the clip attachment. The next shows the section against the inner cap. The bottom four demonstrates the lever filler compressing the ink sac. Demonstrators were for use in selling pens and were not generally offered for sale. They tend to be hard to find.