This bit is plated in a silver coloured metal, possibly nickel or chrome, there are a couple of rust spots on the high port of the mouthpiece.
The cheeks can turn and are curved, each has a decorative plate, which could be removed to allow the mouthpiece to be changed.
There is a curb chain and a slobber or shackle chain.
There are no makers' marks or stamps. I suspect this bit is Latin American
Dimensions : Mouthpiece 4" (10.2cm), Cheeks (not including rein loops) 6¼" (15.7cm)
542g (1lb 3oz)
Ref : bit454