St. Helena Medal - napoleon III

[fpicoli]

Hi,

I didn't knew where to post it because there is no thread to french napoleonic imperial era. This is the St. Helene Medal:

Created in 1857 by Napoleon III for issue to surviving soldiers of Napoleon Bonaparte's "Grande Armee"1 who had served between 1792 and 1815. It is Believed that 405,000 were issued. Obverse shows the bust of Emperor Napoleon I. Reverse inscription reads: "Campagnes de 1792 a 1815. A Ses Compagnons de Gloire sa Derniere Pensee Ste. Helene 5 Mai 1821" The designer was Albert-Désiré Barre, and his mark (an anchor) is below the bust.

I wonder if its a real one or a replica??????
Can anyone help me?????