'Nikolaus, Hereditary Grand Duke of Oldenburg (German: Nikolaus Friedrich Wilhelm von Holstein-Gottorp, Erbgroßherzog von Oldenburg; 10 August 1897 – 3 April 1970) was the eldest son of Frederick Augustus II, Grand Duke of Oldenburg, last ruling Grand Duke of Oldenburg. He was the titular pretender from 1931 until his death. Bain News Service,, publisher. Duke Nicholas of Oldenberg [between ca. 1910 and ca. 1915] 1 negative : glass ; 5 x 7 in. or smaller. Notes:  Title from unverified data provided by the Bain News Service on the negatives or caption cards. Forms part of: George Grantham Bain Stock Photo