The MB01 and 02 definitely run a 1/4” large. My TB mare went in a custom 4 3/4” sweet iron MB01 Dee, and in every other bit, she was a standard 5”.
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Yep, I have come to see this 
I measured it, it’s definitely a 5", but the way the bit curves makes it fit large I think.
Interesting update on my end. Bought this one. Cheap and he was quiet in it. Who knew? I got something heavier thinking he might like the support instead of the lighter ones. I think I was right. The curve is also amazing. We may have a winner!!! JP Korsteel Curve Copper Oval Link Eggbutt
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