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This 1904 official correspondence, originating from the Portuguese Consulate General in Canton, documents a formal request concerning nationality affirmation by two Macau-born Portuguese subjects, Felisberto Reis Graça da Cruz and Thomás José da Silva Louceiro. Dated 23 May 1904, the letter—assigned reference No. 1489, Case File No. 174, Series B—is addressed to Conselheiro Menezes de Souza Pereira de Lima, then Minister and Secretary of State for Foreign Affairs in Lisbon. The document transmits sworn applications from the named individuals, who, having been recruited into the Chinese customs service, sought to formally affirm their Portuguese nationality through an oath. As native subjects of Macau—a Portuguese-administered territory at the time—their need to substantiate national status underscores the complex jurisdictional and administrative dynamics affecting colonial subjects in southern China during the late Qing period. The communication highlights procedural protocols within the Portuguese consular system regarding the recognition and validation of citizenship claims abroad. Situated within broader imperial and diplomatic frameworks, this file offers primary evidence of individual engagement with colonial bureaucracy, as well as the intersection of employment in Chinese state institutions and foreign subjecthood. The document serves as a valuable source for historians examining nationality, identity, and cross-border administration in early 20th-century South China and Portuguese colonial affairs.