Rumford Medal is a prestigious award. It has been awarded to European scientists from 1800. The first recipient was Lord Rumsford himself.
The best information on the award winners was the Portuguese Wikipedia article. For once the data in the English article was not really usable because the names where combined in a template. A template that has been deprecated.
The Portuguese Wikipedia includes more articles so several Wikidata items only have articles in Portuguese. The 2016 awardee only has an English article and it does not mention that Mr Ortwin Hess received any awards at all. The article suggest that the award was last awarded in 2014...
When you add information from Wikipedia, it is important to inspect the data. When everything goes as planned, the items for the winners include that they received at least one award. Someone else may append the data for instance the date when people received their award.