flag of the Royal Princes of Italy, from 1880 until 1946.
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<ul><li>Ufficio Collegamento Stampa del Ministero della Marina. <i>Almanacco Navale 1943 - XXI</i>. Milano, Arti Grafiche Alfieri &amp; Lacroix, 1943.</li>
<li><a rel="nofollow" class="external text" href="https://flagspot.net/flags/it_royal.html">Flag of the world</a></li>
<li>Adopted by royal decree of 28 November 1880. (Decree published in: <i>Gazzetta Ufficiale del Regno d'Italia</i>. n. 310. 31 December 1880, p. 5625 <a rel="nofollow" class="external autonumber" href="http://augusto.agid.gov.it/gazzette/index/download/id/1880310_PM">[1]</a>)</li></ul>