Thank you for bringing a first here! This is the first flat York horn I have ever seen and I have been collecting since 1953. It is a very intereesting piece. Glad to see it. These are about as rare as a swivel breech is from Bedford County.
If this one exists, there must be others; it would be nice to see a screw tip, York flat horn. The bottle nose on this one identifies it as being York. Thanks again,
Dick