Copper wire wrap is actually not a severe bit. Its nice and warm for the horse, makes his mouth salivate, and the wire is wrapped close up, so there are no gaps.
Jointed bits like your ebay example are commonly referred to as snaffles here, looks like a version of a butterfly or Argentinian snaffle to me. It seems that 'snaffles' don't have curb slots looking at these bits. I have something similar in a box somewhere, and just as 'rusty' looking.
i have a full-cheek one of these, bought it about 20 years ago, i've always called it a "copper ridged bit". it works miraculously on some horses for xc, while others completely ignore it. it isn't harsh really, the ridges are close together and very smooth. it stops some horses from leaning, but others don't seem to notice the difference from a normal smooth mouthpiece at all.
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i have a full-cheek one of these, bought it about 20 years ago, i've always called it a "copper ridged bit". it works miraculously on some horses for xc, while others completely ignore it. it isn't harsh really, the ridges are close together and very smooth. it stops some horses from leaning, but others don't seem to notice the difference from a normal smooth mouthpiece at all.