According to Edith Reiter's 2014 book this instrument was completed on 1 February 1992.
Howe & Hurd (2004) describe heckelphone #4994 as a model 36k.
As of 2020, heckelphone #4994 is located in Vienna, Austria, owned by the Vienna Symphony (Wiener Symphoniker), who acquired it directly from Wilhelm Heckel GmbH.