heres the issues I have with the button Bamaart...
The button's construction is all wrong with buttons from Rochambeau's time period . they should be made or cast pewter or brass.
the number and design , the loop all look machine pressed or stamped and very modern as well.
theres no patina on the button and after over 200 years in the ground there would be more.
I know another member here found a similar button on a town green where Rochambeau's troops were suppose to have been as well , his looked more like an early 50's or 60's crude re-enactors type .
Dan