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Recently I received a Bayard Souverain cartridge fountain pen, made in France probably in the 1970s. It has a nice 18-carat nib with a good amount of flex. I wanted to get it back in service. After exhausting my supply of various makes of cartridges an internet search and French pen blogs indicated pens made by Bayard, Unic and Stylomine use a ‘BUS 5’ cartridge (BUS = Bayard, Unic, Stylomine). The BUS 5 is no longer manufactured. Fortunately my local pen store (Bromfield Pen Shop) came up with a solution. After a number of tries the answer is to use S. T. Dupont propriety ink cartridges. It stands to reason as Dupont is based in France. The fit is initially a bit tight but the Dupont cartridge works well and stays in place. The ink flow is what one would expect and want. I’d be interested in hearing if anyone knows of other cartridges that might fit -- one similar in dimensions to the S. T. Dupont but only slightly larger around the interior neck opening pierced by the section. Here are some photos of the Dupont cartridge and the Bayard Souverain.