According to Edith Reiter's 2014 book and additional research in the Heckel archives, communicated by Georg Otto Klapproth (Germany) to Michael Finkelman (USA), this instrument was completed on 14 December 1904 and sold, together with two bocals and three reeds, to Theodor Kräusel of Östersund (Sweden).
The further history of heckelphone #2, including its current owner and location, are presently unknown.
Based on information provided by Howe & Hurd (2004), heckelphone #2 is a model 36 with nickel-plated mechanism, in low-pitch tuning and a range down to low B.