According to Edith Reiter's 2014 book, this instrument was completed on 10 September 1905 and sold to a customer in Germany.
Howe & Hurd (2004) describe heckelphone #10 as a model 36a. As of their writing, it was located at the Semperoper in Dresden, Germany, where it had also been used in the premiere of Salome on 9 December 1905. In 2005, the instrument was heard in a 100-year anniversary performance of Salome.