Frogs were made with and without the retaining straps. Personally I have never understood the need for them, the Sg84/98 as used during the Nazi era was well secured in it's scabbard so it isn't required to keep the bayonet from falling out of the scabbard but it does keep the bayonet and scabbard from moving around some. You will see some of the retaining straps removed by cutting on original frogs.