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Hello everyone at the fountain pen network. Today as always I come to ask your advice and share your wisdom and opinions to be able to solve several doubts that I have in my head. I love both modern and vintage fountain pens from the bottom of my soul, most of my feathers are modern and I only have one vintage that is my prized "51" parker. And I've decided that it's time to get another vintage pen but an older one and I've always had the desire to get a vintage fountain pen of ebonite with flexible nib is a great historical piece that I wish to own in my little collection. Now I have the money available to buy one but I have a lot of doubts about which one I should get. I have three ebonite in my sights that I want to obtain but at the moment I can only get one. hese are the fountain pens that I want to get: Parker Jack Knife Safety Fountain Pen - BCHR, Ring Top, Fine Full Flex Lucky Curve # 2 Nib (Excellent, Restored) https://www.peytonstreetpens.com/parker/duofold-lucky-curve/parker-jack-knife-safety-fountain-pen-bchr-ring-top-fine-flexible-lucky-curve-2-nib-excellent-restored.html------------------------------------------------------------------------------------------------------------------------------------------Conklin Crescent 2P Fountain Pen - BCHR, Fully Flexible Fine # 2 14k Nib (Superior, Restored) https://www.peytonstreetpens.com/other-u-s-pen-makers/conklin-pen-co/conklin-crescent-2p-fountain-pen-bchr-fully-flexible-fine-2-14k-nib-superior-restored.html-------------------------------------------------------------------------------------------------------------------------------------------Conklin Crescent 40 Fountain Pen - Large BCHR, Wide Cap Band, Flexible Medium 14k Nib (Excellent +, Restored) https://www.peytonstreetpens.com/other-u-s-pen-makers/conklin-pen-co/conklin-crescent-40-fountain-pen-large-bchr-wide-cap-band-flexible-medium-14k-nib-excellent-restored.html---------------------------------------------------------------------------------------------------------------------------------------------- I like aesthetically more conklin but my biggest doubt to decide to choose one of these is about filling system of these fountain pens which is better? button filler or crescent filler system or level filler? I understand that both have to change the rubber bag every so often, but I ask about their internal mechanisms which is better, more reliable and robust and which pen is easier to maintain and change the bag.I have already attached the links so that they can see them and help me to take my decision and that they can tell me the pros and cons of these mechanisms