Three sketches for flatware, ink, pencil

Three sketches for flatware, ink, pencil, watercolor and body color, 18th, 19th and 20th century design sketches for flatware, all signed lower right "G Keller a Paris" (Gustav Keller Frere Paris, founded 1857), grime, hinged at top, slight browning and toning, all matted within one wood and gilt silver frame, 12 x 8-1/4" each (Bookout Collection)