On October 1, 1969, Guernsey issued definitive stamps featuring „Views and coats of arms“. Two of the stamps displayed maps of Guernsey including longitude and latitude. The latitude read 40°30'N but should have read 49°30'N. In correction of that mistake did Guernsey issue two replacement stamps on February 2, 1970.

Top: Stamps with wrong latitude

Middle: Zoom into the blue stamps

Bottom: Corrected stamps

First Day Cover with corrected stamps