I'd hand quilt it because of the era of the quilt. The machine piecing isn't going to show but great-grandma would have hand quilted that. Machine quilting will get the job done but this one is a family treasure that deserves the attention of hand quilting. Just as it really jolts me to see someone having spent hours/years embroidering quilt blocks and then have it machine quilted. It just doesn't "follow suit". I guess that's why I'd hand quilt the quilt you have now--it goes with the character of the quilt.