Here is a nice correction curb from Myler. Either an older one or a custom ordered one, as this isn’t available for purchase aside from custom order any more. This one, while likely a bit older, is in excellent used condition, with the sweet iron mouth hardly starting to rust. 5″ mouth, 1 7/8th” port in the 43HP Narrow High Port Barrel style, and is a level 3 bit with 8″ Cavalry shanks. Per Myler:
The MB 43HP does not rotate on to the tongue, but instead sits solidly across the bars and lips of the horse’s mouth. The port is narrower than a Level 3 mouthpiece, but still offers room for the horse’s tongue to pass under the bit. Because the port is narrow, when the reins are engaged, the horse will feel a slight pressure on the outside edges of the tongue — a gentle reminder rather than a strong reprimand. The port on this mouthpiece is 1 ⅞” high, so it could apply some palate pressure. Sweet Iron mouthpiece oxidizes and encourages salivation.