There is no patent date or patent pending stamps on it. It is very good all rivets are solid and not loose where it attaches to the heavy bayonet lug. It has the three correct screws on the side to clamp it on the barrel. The item "Winchester 1897 trenchgun heat shield WWI USMC with bayonet lug" is in sale since Wednesday, February 22, 2017. This item is in the category "Sporting Goods\Hunting\Gun Parts\Shotgun".
The seller is "waxyhoward" and is located in Lincoln, Nebraska. This item can be shipped to United States.