Access to the tariff quotas for hand-woven products is restricted to the products referred to in Annex V accompanied by a certificate of authenticity issued by the competent government authority in the beneficiary country and conforming to the specimen in Annex VII. These goods shall bear a stamp approved by the said authorities at the beginning and end of each piece; by way of derogation, a seal approved by the authorities of the country of manufacture may be affixed to each piece.