According to Edith Reiter's 2014 book this instrument was completed in 2002.
Howe & Hurd (2004) describe heckelphone #5012 as a model 36 voll cons.
As of 2020, heckelphone #5012 was located in Wiesbaden-Biebrich, Germany, owned by Wilhelm Heckel GmbH, who kept it as a demonstration instrument after its completion in 2002.