A Small Antique Curb Bit for a Horse - possibly Brazilian - Bit783

This is a small steel horse bit with a dark patina
It has a medium height port with sleeves or rollers on each side of the mouthpiece.
It has fixed flat cheeks.
The double curb chain looks South American.

Dimensions : Mouthpiece 4" (10.2cm), Cheek length 4¼" (10.8cm)
Weight : 267g (9½oz)