Montblanc Writing Instrument Heritage Baby Rollerball Pen Black M 127852. Montblanc’s ‘baby pens’ of the 1910s and 1920s were some of the smallest writing instruments of their time – and among the most innovative. Leakproof, travel-sized and easy to use, their forward-thinking design helped to transform the world of writing during a period when people were discovering the joys of mobility on a grand scale. Now, reinterpreted for a new generation, these special baby pens unite heritage design with 21st century craftsmanship.