I went to an estate sale Sat afternoon and I found a pair of these in misc basket of desk drawer items. I can't find them for sale anywhere.
I have one pair I bought about seven years ago. I had no idea how useful they would be. They are a must for set in seams, no marking. The edge of the fabric stops at the end of the 1/4" almost automatically. You can cut deeper if you want though.
My sew buddies are always asking to borrow them for certain quilt projects.
Here is an old post about them and a video how to use them for flat seams in diamond block and set in seams. Excellent for applique too.
Mary J's 1/4" Quilting Scissors. Anyone use them?