I have this one, it also has a nose band, but I think it is a bit to heavy for my colts!!
735 Camarillo Sweet Six Competition Bit
3-Piece Twisted Dogbone
5" cheeks - 5 1/2" mouth
Created with a larger diameter shank for more curb leverage as speed is added. The sweet six competition series helps move a horse into the bridle while still offering direct control for lateral suppleness and curb for longitudinal collection. The twisted mouthpiece and dogbone have a lighter and more immediate response. The dogbone offers more even tongue pressure than a traditional two piece snaffle. Combined with educated riders hands and increased pressure toward the sides of the horses mouth result in effective control when speed is added.
here is a picture and a couple more bits I bet you don't see used a lot anymore