Yes, you are correct Lead Thrower.

Vision Hooks are based off of the original Mustad sizing. Mustad's been around long before Gammi.

If sized off a Mustad, they are the same. But, yes, if you use Gammi as your sizing tool, then yes, Visions are one smaller..or close to that.

Unfortunately, many people use Gammi as a size comparison.
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T.K. Paker