Harrison Salisbury won several awards not only the Polk Award. The Ischia award did not have a date associated with it. I used Awarder and the data from the Italian Wikipedia because that was most convenient.
There was no article for Mr Salisbury in Italian and consequently there was no date associated with him. Mr Salisbury is represented with a red link. It indicated 1990 and it was an easy manual edit.
As you can imagine, that red link could link to the information about Mr Salisbury on Wikidata. Showing this information to those who are interested in writing a Wikipedia article in Italian does provide pertinent information, information that should coincide with the new article. By comparing the information in Wikidata and in existing Wikipedia articles you know that the article is likely to be correct.