Very interesting item. This is the first solo usage of a half-cent documentary battleship revenue stamp that I have seen. It appears to be a promotional 1-month accidental insurance policy from the agent A.B. Cilley in Boston, the policy itself from U.S. Casualty Co. Very innovative marketing idea!
![](https://i0.wp.com/revenue-collector.com/zoomify/5320display.jpg?resize=640%2C1004&ssl=1)
![](https://i0.wp.com/revenue-collector.com/cancels/5320c.jpg?resize=340%2C311&ssl=1)