Welcome, Anne,
Thank you for sharing your lustrous strand of pearls. I'm no Miki expert either, but these definitely look authentic and high quality. Wow, they look barely worn, as the silk isn't dirty and stretched. The logo may be earlier than we usually see, it is slightly different, more decorative logo. Also the bead tips used, instead of being finished with french wire. My feeling is they are earlier than 50's, maybe even 30's. Don't recall that we've seen that exact style clasp either.
What size are the pearls? I'd certainly recommend restringing and knotting between each pearl, not just the end ones.