Saw these advertised in one of 7dayshop's newsletters. You can choose between the new type chargers with the 2mm pin, or the original 3.5mm pin version.
These are genuine Nokia branded chargers but are supplied unboxed. They can be used on 100-240V supplies so suitable for use abroad with an appropriate travel adaptor.
Between them they should work on pretty much any Nokia phone except those that charge via USB.