I was not aware that a shandigan blade required a sharpened top edge. I was going by the protrusion on the bottom of the blade next to the hilt and that the blade itself looked to have a double bevel. Here is a photo of one of the two examples I have in my collection. I do not believe that I have ever taken ones of the other, but if I have I will post a couple of it as well.
Neither of the examples I have include a sharpened area (false edge) on the top of the blade as shown in Bill's last photo.