While fighting Shiki and his massive fleet, it was shown that Roger wielded a sword in one hand and a gun in the other. Roger also wielded a sword in the fight against the Rocks Pirates.
Then he used a sword against Whitebeard in their final fight.
Is Gol D. Roger’s sword one of the 12 Supreme Grade Swords?
Just compare the 2 images below, I think it’s self explanatory.
From chapter 912:
From chapter 966: