Are vintage crochet hooks sized differently? I have the original packaging from the 60's or 70's. It's hero brand & says size i but it's too small to be 5mm. Size 6mm

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Vintage HERO Crochet Hook Metal Size 0 + Plastic Size G 5 Standard made In USA

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This is a lot of 7 crochet hooks. You will get all the hooks in the photos. My photos are of the actual item you are getting.

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Used condition as pictured. One Hook is plastic and the other is metal.

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Are vintage crochet hooks sized differently? I have the original packaging from the 60's or 70's. It's hero brand & says size i but it's too small to be 5mm. Size 6mm