According to Edith Reiter's 2014 book this instrument was completed on 1 December 1991 and originally sold to a buyer in Italy.
Howe & Hurd (2004) describe heckelphone #4995 as a model 36 voll cons. It appears to be equipped with a bocal made by noted oboe maker, Thomas Hiniker of Rochester (MN), USA.
As of 2020, heckelphone #4995 is located in San Francisco (CA), USA, owned by the San Francisco Symphony.
How this heckelphone made it from Italy to San Francisco remains unclear.