Fine quality Zwicky sewing silks dates from the 1960/70's and has been stored wrapped in cellophane in their original boxes.
These are size 50/3 on massive 1500 meter spools.
I used Zwicky silks like these for many years weaving scarves, fabric and making tassels as shown the the pictures with the silk.
Also perfect for embroidery.
These are a russet/mahogany brown.
Price is per spool.