1918/17 Buffalo Nickel Question

I recently bought ten dateless Buffalo nickels. I'm trying to use vinegar to expose the dates, and so far it's working. I've got a 1929 D, 1920, 1919, 1918, 1916, 1916 D, 1913 Var 1, 1913 D var1, and the rest are still soaking. But, tonight I pulled one out to check it, and it looked like a 1913 Var 2. But as I looked longer under magnification the 3 began to look like an 8, and the top of that number was flat, like a 3 or a 7. I looked in the Red Book for a pic to help me, and I noticed the 1918/17 error. Then I looked at my nickel and the top of the last number looks doubled to me. It's too worn to tell for sure though.

Another problem is that I can't see a clear D on the reverse, since the rim has been flattened over where the D would be. I think I see a faint D, but I'm just not sure.

So, my question is: does anyone know how to ID one of these in this bad a condition, or does anyone have a pic of one in worn shape.

Thank you.