A man holding a rifle ( recto ); A further study of the same ( recto )

Attributed to Jacob Martens (Ghent 1579/80-Amsterdam 1647) A man holding a rifle (recto); A further study of the same (recto) with inscription 'Jacob Marten[s]' black and white chalk, brown ink framing lines (recto); black chalk (verso), on blue paper 8¼ x 4½ cm. (20.9 x 11.6 cm.)