I thought I should add a couple of points to this topic as I faced a similar situation in relation to the Medaille de la Reconnaissance Francaise. My grandmother was awarded this medal in 1918 along with a number of other medals. At some stage (I believe in the 1960s) after her death the medal was removed from the set. Who did this and why I have no idea but a medal set should never be broken up.
About four years ago I was entrusted with the families medals and went after this lost medal. After around a year of seaching on and off I managed to obtain another which was apparently award to an Italian in 1918. That Italian became Minister for Ceremonies under Mussolini's government. I examined the medal and found no trace of any name engraved on it - result I have now a full set.
My advice for what it is worth, you should be able to hunt one down but don't expect it to be easy. Try and ensure you get a good ribbon with it otherwise you will have a major problem in obtaining one.
I've uploaded a picture of the set for reference.
Regards
Jeremy
