According to Edith Reiter's 2014 book, this instrument was completed on 23 October 1907 and sold to a customer in Germany.
Howe & Hurd (2004) describe heckelphone #38 as a model 36b. As of 2021, it is located in Gelsenkirchen, Germany, belonging to bassoonist Thomas Kiefer.
The history of heckelphone #38 remains mostly unclear.