I was just following an eBay auction for a single large (1 1/2" or so) red "amber" phenolic bead like yours and it sold for over $600 (eBay 201343907023). Check the sold listing and some individual beads are going even higher. There is another being offered for $999 (eBay 221768007841). Based on that I would say your strands are quite valuable right now, well into the thousands. You might want to follow the auctions for a while to get a better feel for realized prices. You'll need to search for "cherry bakelite bead", "cherry amber bead", "red bakelite bead" and maybe also "cherry red copal amber Bead" since a variety of terms are used for this bead material.

The term "Faturan" is also sometimes used for old phenolic resin beads.

Great beads you have there!