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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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

Why I want to use ONLY Vintage and Antique Crochet Hooks