According to Edith Reiter's 2014 book, this instrument was completed on 30 May 1925 and originally sold to a buyer in an unknown location.
Howe & Hurd (2004) describe heckelphone #3915 as a model 36i with nickel keys, tuned at A=440.
As of 2004, this heckelphone was reported to be owned by Paul Bennett of Hartfordshire, UK. Its history remains largely unclear.