The sword is authentic and as you state has matching nos. with the scabbard , that is always a big plus . Most collectors would hate what has been done to the sword but you cant turn the clock back . I presume your friend is not a collector but has received the sword as a family heirloom i am leaning towards leaving it as is , it would make a nicer display ! I say this as the leather to the scabbard looks professionally done and looks good and the paintwork has been applied with great care . As i say , it's a shame its been messed with but it still is a vet bringback !