Please share what your grail pen is. I’m really curious
Grail is what your ultimate quest is. I would define these as pens that are hard to get thus makes it a quest to obtain them. Quest can be trying to hunt down a limited edition pen for years by going to pen shows, looking for last available pieces in obscure shops around the world, keeping in touch with collectors and so on. Sometimes financial constraints can make a widely available pen a grail for you because it’s a quest to find one that fits your budget or save up for it.