is Grundmann, no umlaut-U, see Bundesarchiv listing: http://www.bundesarchiv.de/gedenkbuch/directory.html?id=1080933&submit=1&page=1&maxview=50&offset=0
Addition
is Grundmann, no umlaut-U, see Bundesarchiv listing: http://www.bundesarchiv.de/gedenkbuch/directory.html?id=1080933&submit=1&page=1&maxview=50&offset=0