@FPLover @christianp the Preppy doesn't take internationa cartridges, but they sell an adaptor to be able to use them.I've bought the adaptor (iirc it was about 1 €), but I've never used it, because I also splurged on converters for each of my preppys (yes, they cost more than the pen, but I expect them to last, and I like to use bottled ink)(anyway, I second, third, thousand-or-something the recommendation for preppys, imho they are one of the best fountain pens for just writing)