Eugene ZAK (1887-1926), Portrait of a young man, studies of male heads, interior sketch

pen, black ink, pencil, light cream paper, approx. 100 g/m2; 21.8 x 17.5 cm (sketchbook sheet);
At bottom right facsimile of artist's signature: Eug Zak;
below the portrait an unread inscription in French, in black ink.
The drawing is from Eugene Zak's sketchbook. Written by Zak's hand (in pencil) on the sheet of the sketchbook's lining is the beginning date 23/XII 02 [23 December 1902].

Attached to the drawing is a confirmation of authenticity made by the Art Consultant Agency of Adam Konopacki, dated March 15, 2021.