A string favorite

This quilt is one of the first I purchased and one of my favorites still. On the back I wrote a note that I purchased it in 1979 along the roadside in South Carolina. The seller told me his grandmother made it and that she was 90 years old. Unfortunately, I was too much of a rookie then to ask Grandma's name.
It's a classic string quilt and measures 56" x 76". Each 7" block is separated by sashing from 2 different fabrics. It's machine pieced and hand quilted. The muslin backing turns to the front to finish the edges on 3 sides, the sashing turns to the back to bind the left side. The black fabric reminds me of fabric in one of mom's skirts in the late 1950s/early 1960s.