Looks like a Lupo mirror with a painted cover, and blue tinted glass, I'd take a trip down to the dealer to see if they can identify what it is .. expect a slap when they tell you how much it is! or get on to your nearest Euro car parts, or GSF to see if they can supply a non genuine replacement part, for probably half the price of the real thing.. If someone has fitted these before you bought the car, chances are that they are non genuine anyway
Tom