Man on a horse was drawn on the verso of an unrelated letter from a clergyman, Rose Fuller Whistler (1825-1894), Ashburnham Vicarage, Sussex, to Whistler, on 22 August 1887. 1 The letter is not related to the drawing. It is possible that it was drawn at Buffalo Bill's 'Wild West Show'.

Man on a horse, Glasgow University Library

It is fully catalogued in MacDonald 1995 (cat. rais.) [more] (cat. no. 1148).