About the Design:

Obverse "Marianne's head left wearing a phrygian cap decorated with a composite wreath made of olive tree leaves, oak and wheat.

Lettering: 
REPUBLIQUE FRANÇAISE
MORLON
Translation: FRENCH REPUBLIC

Reverse: Value encompassed on either side by Cornucopia (or horn of plenty, overflowing with produce, flowers or nuts).

Lettering: 
LIBERTE·EGALITE
FRATERNITE
50
CENTIMES

Translation: 
FREEDOM·EQUALITY
BROTHERHOOD

Metal            Aluminium
Weight             0.8 g
Diameter    18 mm
Thickness    1.4 mm