Gustav III of Sweden ?. 18th c Drawing, watercolour,... Lot 49

Gustav III of Sweden [?]. 18th c Drawing, watercolour, 11,9 x 10,2 cm (framing line) with margins added on edges, parchment, signed with illegible monogram at bottom left (IF?) (sl. wavy at top left and right). Hinged at upper edges, under passe-partout. Colourful portrait of a Northern European monarch, possibly Gustav III (1746-1792), King of Sweden from 1771 to 1792.