Longsword 1440 found in the Thames near London.
Type XX according to Oakeshott can be regarded as the last of the true Martial swords ("War sword") like XIIa or XIIIa. This type was used in the middle of the fifteenth century. The defining characteristic of Type XX swords, but his large size - are particularly blade. Often on the blade of the sword is two parallel dale, or two short parallel dale long central fuller.