King George V and Queen Mary, circa 1901.  Although the images are labeled King and Queen, the images were older images republished with their new titles;  the one of Mary specifically dates from their 1901 tour of Canada, wearing mourning for Queen Victoria.
Unknown author<span style="display: none;">Unknown author</span>
1901
Hopkins, J. C. 1910, 'The Life of King Edward VII', p.466-7.