This viola was made by Helmuth Keller & Son in Philadelphia.
Additional Specifications
| Availability | available |
| Maker | Helmuth A. Keller |
| Country | United States |
| City | Philadelphia |
| Year | 2008 |
| Body Length | 430mm |
| Upper Bout | 247mm |
| Middle Bout | 146mm |
| Lower Bout | 248mm |
