King of Spain from 1886 until 1931, who was proclaimed king at birth and assumed leadership at just 16 years old (1886–1941). LS in French, signed “Alfonso,” one page, 8 x 10.25, December 17, 1917. Official letter of state to the Grand Duke of Oldenbourg congratulating him on a royal birth in the family. In fine condition. Pre-certified PSA/DNA.
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