Original U.S. model 1816 bayonet measuring about 19" long with a blade of about  16" long. the socket OD diameter is about 1.20" wide at the breech, and about 3.23" long. Blade well marked:something over  US,  This blade easily fits on one 1816 barrel but another 1816 barrel won't fit as they sometimes soldered the front sight not in same location.Bayonets were fitted to a musket before being issued.Very skin and no pitting, not bright, but surface patine, with numbers stamped to right  side of tube with  a8 and 116?  Sorry, NO Foreign Sales.. NO EXCEPTIONS!!!! Check my inventory for unusual and rare gun parts and other items. I  work  hard to find unusual items, and  try to keep the price affordable. My   descriptions are what I see, good , bad, ugly, etc. when listing. Rarely do I miss something in listing. If you buy and item and are not satisfied let me know immediately rather than leave negative feedback, we  can come to some arrangement that will make you happy. I describe items to the best of my ability, however, sometimes it’s a good guess, as I don’t take things apart and sell, I find huge quantities of stuff from other people, not described by them. I think that several photos and several measurements should work for you. If you’re not sure an item will fit, best to not buy. All listings have a return privilege.  Sometimes I travel for my job and I’m not here for three or four days. I ship as soon as I can but  not  always immediately. Please be patient. Thank you for having confidence in me  and  bidding.