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Hutsitedigger, the backmark in the photo is "BEST STRONG" -- written in Old English Script lettering. The rest is the typical "STANDd" -- which is an abbreviated form of "STANDARD" [quality].
Fano169, if your button is the same as the one in the sample photo (except possibly a different backmark), your button is called a brass 1-piece flatbutton, made for Civilian-clothing use (although a few did get used on Militia uniforms), dates from about 1810 into the 1830s, and was more likely manufactured in Britain than in the US.
If your brass 1-piece flatbutton's backmark is written in "raised" lettering( instead of the "indented" lettering shown in the sample photo, it can date a bit earlier, from the 1790s into the 1830s.