It is a demonstrator of the Pelikan 400NN from around 1956 to 1962, originally produced only in small numbers for demonstration and advertising purposes — in contrast to demonstrators issued today in larger series. There was also a green-transparent variant. Demonstrators are sought-after collector pieces today and achieve higher prices in good condition than the regular green-striped or tortoise-coloured 400NN. Reliable values, however, only result from realised auction prices, not from desired or asking prices of individual sellers.