What a great find! My friend has a quilt top like this. I promised her would be my next hand quilting project. The Virginia state bird on the quilt is a robin. Since I lived in Virginia I knew the state bird is now a Cardinal. So I checked on line and the Cardinal became the state bird in 1950. So I know the quilt is at least 60 years old. I’m not an expert but I am guessing your pieces might be that old too.