Horned Pond-Weed, about 1800.

"Zannichellia Palustris" copper engraving with original hand colouring, published in a botanical work around 1800. Plate mark and good margins, but with an old indistinct library stamp upper right which is over the plate mark. Size to plate mark (area shown in scanned image) is about 12 x 17 cms. Ref E2396