Montblanc Slim Line Fountain Pen. Fountain Pen (Cartridge Filling System). This is a vintage Montblanc Slim Line fountain pen. It has a steel nib, the size is F, works well. But has some minor wears due to age.This pen comes with an old type converter. International Buyers - Please Note. These charges are the buyers responsibility. We do not mark merchandise values below value or mark items as gifts - US and International government regulations prohibit such behavior. The item "Montblanc Slim Line Fountain Pen Matte Black Steel F Nib" is in sale since Tuesday, December 11, 2018. This item is in the category "Collectibles\Pens & Writing Instruments\Pens\Fountain Pens\Montblanc". The seller is "kumastar" and is located in Osaka. This item can be shipped worldwide.