License built version of Sikorsky S-61D with Japanese engines and avionics. 4 built for JMSDF service as SAR helicopters on Icebreakers and Iwo Jima. 
List of Operators of S-61A-1 |
| Years | Model | Org | |
|---|---|---|---|
| 1964/08 | S-61 |  Japan Maritime Self-Defense Force |
Global Distribution of S-61A-1 |
|
Construction Numbers |
| C/N | Year | History | |
|---|---|---|---|
| M61-075 | 1968 | 8184 | |
| M61-175 | 8186 | ||
| M61-178 | 8187 | ||
| M61-187 | 8185 |
