Thanks for ya'lls comments. Several interesting aspects to these horns are when they are marked in some ways. The large horn at the bottom of the picture is marked with a painted "No. 15" on it main body. I am assume this means that the horn was assigned to "Gun" number 15, but I might be wrong. Possible naval cannon? There is also remnants of what I think is original green arsenal paint on the base plug, and filling screw.
Two of the horns are engraved. One with some British military coat of arms, and a map of the Boston area, showing various fort/battery locations, etc.. The other engraved horn
has an eagle, skeleton, bear, sun, and possible Masonic symbols.
Thanks, keep the comments coming..........
Don Millman