Well, Europe is just a collection of states now, and they have one currency. I work in the import business and I often see Europe listed as the country of origin (where the goods are made) listed on import invoices. These invoices are created by folks in Europe, so some over there must think it's one country too.

One a side note, it's not correct to list Europe as the country of origin on a product or import invoice. It has to be the specific country.