This is an unusual piece.
I think it is Gold (Not marked) It's a little bigger than a quarter in size.
It commemorates the start of the war with Germany and France
The Verdun was the city in France where the Germans attacked
And the 21 Fevrier 1916 was the date the war started
February 21, 1916
The war lasted until December 19, 1916.
I would rather find a goody like this than 50 silvers any day
Here's a link to some info
Good reading!!
http://www.wereldoorlog1418.nl/battleverdun/index.htm
Tim