The 1786 Regulation
It was the first time where swords were introduced and standardized in the military, specifically the spadroon. The regulation required that the sword’s blade should be straight, 1” wide, and 32” long at the guard. The guard should also match the buttons of the military personnel’s uniform, and that every officer in a regiment should have the same type.
The 1786 Regulation was very loose in terms of requirements at that time, and you can find many varieties of the sword. Some swords have even been in service for many years and were even used during the American Revolution.