Even though it was purchased along with some Masonic swords, I would forgo the Masonic attribution, and go to the reenactor's market on this one. Which doesn't mean that this sword wasn't used in Masonic rituals.
Due to the interest in the 18th century military reenactments all over the world, replicas, like this one, are made and sold by many sutlers, and have been for the last 30 years or so.
http://www.re-enactmentshop.com/p_18th_century.htm
http://www.gggodwin.com/cartgenie/prodList.asp?scat=10
http://www.americanrevolution.org/reenact.html
My $.02