The harp becomes a brand signature
Guinness’s official story dates the harp’s first appearance on a bottle label to 1862. That is a documented use of the symbol, not a claim that today’s exact harp drawing or wordmark dates from that year. The emblem references the Brian Boru harp, an instrument preserved at Trinity College Dublin.
From historic emblem to modern logo
The wordmark and harp have been redrawn over time. Guinness notes major refinements in 1968 and 2005; the present identity keeps the instrument as its central cue. Compare this food-and-drink identity with Coca-Cola and Pepsi, whose wordmarks rely on different visual traditions.
Sources and image credit
The Guinness Story documents the harp’s use and identity changes. Displayed harp-and-wordmark artwork: Guinness-Logo-1.png, Evan O’Dunaigh, CC BY-SA 4.0; the image is credited here and remains subject to that license.