copper 
<p>Obverse: date; 
Text: COCHINCHINE FRANÇAISE = French Cochinchina; 
Reverse: denomination (in Chinese); 
Text: 大法國之安南 = Annan of Great France; 
當二 = Equals 2 (van); 
Engraver: Albert Désiré Barre 
Mintmark: A (Paris Mint); privy marks: bee, anchor with a bar 
</p>
Same design was used after 1885 for the French Indochina coins
<a href="//commons.wikimedia.org/wiki/User:Pyvanet~commonswiki" title="User:Pyvanet~commonswiki">Sema (from Art-Hanoi.com)</a>
Attribution
<a rel="nofollow" class="external text" href="http://art-hanoi.com/collection/iccoins/cochin.html">Coins of French Cochinchina</a> (Art-Hanoi)