Without a photo, a reliable determination is not possible; based on the description, the model fits most likely the Montblanc Leonardo Da Vinci. It is not a Limited Edition but an entirely normal ballpoint from the 1990s. Caution is in order if on the pen really Mont Blanc Germany is written separately, since the manufacturer spells itself Montblanc; such a spelling speaks clearly for a counterfeit. For final clarification, it is recommended to post photos in the forum.