The lines identify it by their random structure, unlike engraving. The plate marks fell outside the trimmed page. Hoek Toren c. 1760 is an excellent example of a pure engraving. The print was pulled from a hand engraved plate, unlike etching, hand tools were used to create the ink reservoir. Compare to a bank note which is engraved.
Engraving is a very old print medium.
It is thought that the craftsman who engraved suits of armor first used it around 1400 by rubbing in lampblack and then pressing a piece of paper into it to make an image. Later, the German goldsmiths further developed the technique to print playing cards. The demand for playing cards had thus provided the need for mass production. Engraving with Etching - A mixture of engraving and etching was used extensively in the late Eighteenth century and the Nineteenth century. Foliage and the surrounding environment in the print was etched while the main subject was usually engraved.