Design for a Dress/Travelling Landau carriage

Pen and ink, watercolour, gilt and carriage oils on linen/board (yellow, black) [design for a] Dress/Travelling Landau carriage (with flap revealing an alternate design with hammer cloth or with box) / Barker & Co., London, [ca1820], scale 1/2": 1'(1:24), 13.5 x 24.5 cm.