The model is officially called 'Noblesse Oblige'; the name plays on the saying 'noblesse oblige' (nobility obliges) and has nothing to do with the nib form. An obliquely ground nib would be called 'oblique', which is often confused with 'oblige'. Of the Noblesse Oblige, an older and a more recent version exist, distinguishable by logo and clip design. With authenticity checking of used-bought pieces, the front of the original nib is decisive; the feed is rarely subsequently retrofitted to fit.