For someone that doesn't know much about vintage stones/hones, I'm having a hard time telling what is worth a bid on ebay. I'm starting to recognize some barber hones, and have a pretty good grasp on Arkansas stones, but some of the others are a mystery to me. When there aren't any descriptions or markings on the stones, how do you know what is what? Is it only by experience? And even then, can you really tell just by looking at the photos (most of which have bad color shifts)?