Koyo Maru drawing from U.S.Navy, Japanese Merchant Ships Recognition Manual, ONI-208-J
| Name | 甲陽丸 Koyo Maru |
| Ship Type | Cargo ship |
| Launched/Completed | 1919 |
| Builder | Matsuo Iron Works & Dockyard |
| Tonnage | 3,022 tons |
| Owner | Nippon Yusen Kaisha - NYK, Tokyo |
| Loss Date | September 9, 1943 |
| Location | 35-40N, 140-59E |
| Circumstances | Sunk by torpedo |
| Number of Men Lost | none |
Submarine Information
| Name of Submarine | USS Harder (SS-257) | Patrol Number 2 |
| Commanding Officer | CDR Samuel David Dealey | Attack No. 1096 |
Sinkings by Selected Submarines
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