Superb! Where did you find this information?
Months of digging thru old newspaper archives...There are probably hundreds more cannon sales advertisements but got no time no more to do it. Many libraries have real copies of newspapers that are not On the internet,
, Some on microfilm, Some on rolls: Oakland library, Livermore .ca library ..Mormon library utah, oakland,,.ca historical society libraries have thousands of copies of old magazines and newspapers that have never been microfilm or On the internet. The internet search engines tend to censor these sources if they find them. So you have to go to the New Hamsphire. Mass, Vermont, Pa, ny hist. Society libraries and search in person.
Also just about every small town & village in the 13 colonies has their own historical society libraries, which contain local facts about cannons, blacksmiths, pistols, etc. that cannot be found in any other hist soc. archives...have fun!