Well, I initially thought it could be from one of the Italian states as well, so I went through Modena, Parma, Savoy, Sicily, and Tuscany in Werlich's book. And found nothing. Then I looked at Dorling's ribbon chart and the closest match was for the Order of the Star of Italian Solidarity. But the timeline is off, I think. Since it was nestled next to the last medal on the bar, and the ribbon is very similar to certain Bulgarian order ribbons, I naturally went in that direction.