Sounds like a 27, 28 or 127. If the bobbin winder is on the bottom, it's a 27. If the spool winder is on the bottom, and it's 3/4 size its a 28. If the bobbin winder is towards the top, partially obscuring the sphinx, then its a 127. BTW, you are describing the Sphinx motif which is very pretty. Please post a picture.