According to Edith Reiter's 2014 book, this instrument was completed on 23 October 1907 and sold to a customer in France.
Howe & Hurd (2004) describe heckelphone #37 as a model 36b. As of 2020, it belongs to the Orchestre Philharmonique de Strasbourg and is located in Strasbourg, France.
The history of heckelphone #37 remains unclear.