The ends are odd, nothing like a Kirby. Kirby has a vinyl 'cushion' on each end. Also, Kirby bearing covers do not go 'over' the brush. The nut holding one of the adjustment screws is also odd.
It's possible it's a bojack Kirby brush, but all the bojack brush rolls I've seen are made by CWP which is the OEM for Kirby themselves and are nothing like the one in the picture.