Walt is correct. I neglected to mention that Arthur P. Curtis also built try guns for Ithaca, all of what I have seen have been singles. Yes, I have seen the Lefever try gun built by Arthur P. Curtis that was pictured in the Elliott book. A local collector owned an Ithaca Curtis try gun, but it has slipped away. I have also seen the only Curtis Parker try gun known. An L.C. Smith Curtis try gun is pictured in Eaton, but some say it is actually a Parker since the picture is not clear. It appears to be a sidelock, but other features of the picture suggest it is the Parker #158,664 mentioned in TPS. All I know is that Captain Paul A. Curtis was not a gun designer.