NIKOLAI ROMANOW Autograph - Envelope probably with handwriting

NIKOLAI ROMANOW Autograph - Envelope with probably the handwriting of Lieutenant Nikolai Romanow, officer prisoner camp Gütersloh. Envelope as a prisoner of war mailing addressed to the Moscow Aid Committee for POWs, Copenhagen Denmark, Knippelsbrogade 8. Postmark 21.7.17, stamp officer prisoners camp Gütersloh. It could possibly be the handwriting of Tsar Nicholas II's cousin, Nikolai Michailowitsch Romanow (1859-1919). The letter once contained in the envelope is no longer there. Nevertheless, the envelope here should be a rarity! Signs of age and wear.