These are old & much used bits, the cheeks are worn where they are attached to the mouthpieces.
There is old pitting to the metal, but it has a good patina and the surface is stable.
They have half twisted or reversible straight mouthpieces.
The cheeks can turn, each cheek has two oval slots for the curb rein.
Any stamps or makers' marks have been lost
The mouths are slightly different sizes
Mouthpieces 12.5cm (5") & 12cm (4¾), Cheeks 20cm (8")
Weight 816g (1lb 12¾oz)
Ref : bit578