I have 3 400NN tortoises and have been using one of them extensively for the last few day with Diamine Red Dragon. I have enjoyed it very much. It has a KM nib which is not one I would normally choose, however it has been very satisfying.

Having said all that, I cannot understand why Pelikan went from a brilliant 100N design to pens such as the 400 and 400NN that have no ink window. I live in constant fear that I will run out of ink because I cannot see how much is left. I have started to clip 2 pens into my jacket inner pocket whenever I leave the house with a 400 or 400NN.

Has anyone found a better way of handing this stressful situation?