According to Edith Reiter's 2014 book this instrument was completed on 1 April 2010.
Howe & Hurd (2004) describe heckelphone #5020 as a model 36 voll cons.
As of 2020, heckelphone #5020 is located in Vienna, Austria, owned by the Universität für Musik und darstellende Kunst Wien, which acquired it directly from Wilhelm Heckel GmbH.