I think I might have found out where Revsnaes/Revnaes
Light - Iceland was.
Iceland - North Coast- Sletta - Revsnaes - Intended light. About August 1, 1911 a flash white light every 3 seconds will be established on the extremity of Revsnaes, north coast of Iceland. Approximate position: Lat 66 32 15N, Long 16 09 15W.Index to Notices to Mariners. 1911. U.S.A. Navy Department. Bureau of Equipment. Hydrographic Office 1912, page 26
Reference connecting Revsnaes to Rifstangi, Iceland:http://archimer.ifremer.fr/doc/1930/publication-5857.pdf
page 6 pdf document, page 218 original document
Rifstangi, a salient point, is located 6 miles ENE of Haganes. It is the N extremity of Melrakkasletta and the N point of Iceland. A reef extends NNW for about 0.5 mile from this point.
A disused framework light structure is reported to stand near the extremity of the point, but it is often obscured by dust clouds.Sailing Directions (Enroute) Greenland and Iceland National Geospatial-Intelligence Agency,Springfirled Virginia 2014, page 167