I posted this pistol in another thread but have since come across more information that i believe, warrents a new thread. The pistol appears to be a Rollin White single shot. it is engraved with the initials W.T. Swinburne. rear admiral of the United States Navy and one-time Commander-in-Chief of theUnited States Pacific Fleet. 1866 corresponds with Swinburnes graduation from the naval academy. the pistol is serial numbered 420. i looked at other models online and the frame appears to be notched to accept the cylinder so that the round can go into battery if you look at my pistol you will see that it is not notched and that the cylinder does not close flush with the frame.