Hi, this is actually an old image. I do have this coin in the latest NGC holder.
Thanks, D

First read Herns if you have one. The standard is two little steps in front of the door. In terms of grading NGC only grade 2 varieties, no steps and normal. there is coins with one step commonly referred to as partial steps but only the grade collectors follows those. Open and closed doors refer to the door showing nothing or frosting.

In terms of pricing in ascending order of price, normal steps, partial steps and no steps (graded without showing variety on slab) and no steps showing on the ngc slab.

There is a premium for open doors and premium for cameo over ultra cameos.

The premiums are due to scarcity of graded coins.

Hope this helps.