GUC vtg #1 Nana silvertone necklace

Vintage silvertone necklace with a pendant that says "#1 Nana". The chain is 22" long, and the pendant is about 1" across. The pendant is not magnetic, but the necklace chain is, so they might not have originally come together. I don't see any maker or material marks, but the pendant back is rather intricately designed, so it's a bit hard to tell. The pendant has a goldtone spot on the last A like it used to be gold plated. The dark spots on the first N are places where it is thinner, as though bits of metal may have been chipped off somehow. The chain is in EUC condition, and with a fresh layer of plating, this sweet pendant could be too.