It's a straight stitch foot. I thought it would be great for quilting, but I would have to put tape down to measure 1/4" because I can't move the needle with the single hole, and I can't align the fabric with the right edge of it, because it is too wide.
Thanks Patchy, that's what I assumed but I wondered if I was missing any other way it could be used. Here's a picture, it has two holes.
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