US Navy version of the S-55 powered by a 600hp P&W R-1340-57 Wasp engine. Redesignated UH-19F in 1962, 10 built under contract: NOa(s) 12024. 
List of Operators of HO4S-1 |
| Years | Model | Org | |
|---|---|---|---|
| 1951/57 | S-55 H-19 |  US Navy | |
| 1951/66 | S-55 H-19 | US Coast Guard |
Global Distribution of HO4S-1 |
|
Construction Numbers |
| C/N | Year | History | |
|---|---|---|---|
| 55-006 | 1950 | 125506 | |
| 55-007 | 1950 | 125507 | |
| 55-008 w/o 1951 | 1950 | 125508 | |
| 55-009 w/o 1961 | 1950 | 125509,5509 | |
| 55-010 | 1950 | 125510 | |
| 55-011 | 1950 | 125511 | |
| 55-012 | 1951 | 125512,N9006R | |
| 55-013 | 1951 | 125513,N9756Z | |
| 55-014 w/o 1951 | 1951 | 125514 | |
| 55-015 | 1951 | ,125515 |
