Vintage C Clamps - used for quilt frame

One of the things I got from my grandmother's estate was a set of four C clamps. These were used to hold the boards of her quilt frame together as she quilted.  They appear to be hand-forged, not machine made.
I can remember helping her lay out her log cabin blocks and rearranging them to make a pretty design.  We spread out the yellows and reds to be sure that they were evenly distributed.

When I turned 21, in the mid 60s, she gave me a log cabin quilt of my own that included scraps from many of the dresses my mother had made me.  Some of the fabrics are disintegrating now, and I am carefully appliquing over them with like-appearing fabric in order to keep the quilt useable.