Hello Gavin -- Well, making some headway on the search, but I don't think you'll like what I have so far. I'll start with the OK stuff first. The medal you purchased from Eiltemilitaria was sold on Ebay France on March 10 of this year. It sold for 251,01 Euros (forgot to convert the Euros so that will be for you to do). I know it's the same medal because it has the wrapper and the calling card with all the same "wrinkles."
The second thing is that also in France in another non-Ebay auction a medal, the Yugoslavian Order of the Royal Crown, Commanders Cross had Pouritch's name in the description and a card as well. Here is the kicker: when translated the description says the medal was given to disabled individuals who were injured in 1917-18 in Serbia, by King Peter II. The person PRESENTING the medals was, yep, you got it...Pourtich. So it would seem that our man was probably not the recipient of the medal you have, but rather the presenter, thus the calling card versus award documents for Pouritch.
We are still researching at the college. It was funny, one of our library staff found a website discussing the medal and Pouritch....it was this site! In any case, we'll see what more we can find, but thought you should know. The medal and card are still very important. Who knows, maybe we will confirm it's his after all.
Very best,
Tom