18In that regard, the Court has previously held that national legislation that requires articles of precious metal imported from other Member States, in which they are lawfully traded and hallmarked in accordance with the legislation of those States, to be given an additional hallmark in the importing Member State has the effect of rendering the imports more difficult and costly (see, to that effect, Robertson and Others, paragraph 10; Houtwipper, paragraph 13; and Commission v Ireland, paragraph 27).
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