Nocturne: Grey and Silver dates from between 1875 and 1878. 1 It is possible that it was one of the 'two smaller Nocturnes' described by Whistler as 'unfinished' in his house at 2 Lindsey Row in February 1876. 2
Nocturne: Grey and Silver, Philadelphia Museum of Art
It is dated from the technique, but is hard to date precisely.