Ernie Rissmann Roundar Guitar. RESEARCH #DdO:) - https://www.pinterest.com/DianaDeeOsborne/instruments-for-joy/ - INSTRUMENTS FOR JOY. Ouch, this was a hard one: Almost all the sources I found were in German even when I asked for English! FOUND: This unique acoustic guitar with an odd body is made in Münster, Germany. Since 1994 the luthier builds in small workshop. He learned craft at Hartmut Hegewald in Bönen. Each instrument is a custom creation made with high quality, seasoned tonewood.