Signed, on stone, upper left of image: [Whistler's butterfly device] Signed, in graphitel, lower right: [Whistler's butterfly device]
Watermark, center of sheet: AC on a shield (Art Institutie of Chicago Whistler lithograph catalog watermark no. 2) Stamp, in brown, lower left, verso: [monogram R B within in square] (R. Birnie Philip (1873-1958), Lugt. 406)--Indicates a Whistler lifetime impression.
Inscribed, in pencil, bottom left edge: Way 72 II The Forge, Passage du Dragon Inscribed, lower right corner: c. 17530 (Colnaghi Gallery inventory number)