Strange IEC C5 cable with 2-pin wall connector
I doubt it's an original part.

Note that whilst the others are right, and this should be perfectly usable, since the laptop doesn't need a ground connection and neither does its supply, you might be setting yourself up for a supply that generates unnecessary much noise: in systems where it's not clear what conductor is live and which is neutral, RF is often shorted to PE/ground using appropriate filters. Since notebook chargers are supposed to work in multiple markets, including e.g. Germany, where the Schuko plug doesn't guarantee live / neutral "polarity", RF filters are often integrated into the plugs, leading away RF energy through the protective third connector.

Dell, just like anyone else out there will try to save as much money and space as possible. It's unlikely they'd have a mickey mouse connector without reason.