My grandfather gave me this Mel Pardue mini grip that his wife carried until she died, I've been carrying it for some time now and really like it, so I want to get some other colors. Now I can find plenty with a thumb stud, and some with a thumb hole that's circular like on Spydercos, but none with this odd elliptical thumb hole. Does anyone know what this specific model is called or where I could try and find more? Thanks.