i agree.
that style of fishhook doesn't look very old, and they're still in use.
i don't know about the antique store you bought them from, but several here mix in contemporary 'vintage style' jewelry with vintage and antique. it's unfortunate because nowhere is that stated, so i'm sure a lot of people buy them, mistakenly thinking they're buying real vintage or antique jewelry (as well as other items). not saying that's definitely the case here, but it may be.