This cello is labeled Helmuth A. Keller & Sons, Philadelphia 1981.
Helmuth A. Keller comes from one of the prominent violin making families of Philadelphia. Son-in-law of Martin Nebel – who worked for Wurlitzer in New York and then opened his own shop in Philadelphia – Keller came to Philadelphia from Germany after the Second World War to work for William Moennig & Son. In the early 1960s, he opened his own business which continues under his son, Stephen Keller.
Additional Specifications
| Availability | available |
| Maker | Helmuth A. Keller |
| Country | United States |
| City | Philadelphia |
| Year | 1981 |
| Body Length | 762mm |
| Upper Bout | 349mm |
| Middle Bout | 246mm |
| Lower Bout | 442mm |
