It is strike doubling not a DDR. Although a nice looking coin, the carbon spot and nicks and dings especially in the focal points keep it below a 66.
Gee, I'm starting to LIKE quitters. I'm not quite sure HOW I feel about quiters, though. Can I get back to you? That is some darned fine stapling technique there, old friend. One thing, though. Look into a "flat" stapler. The rounded type can easily scratch a coin stacked with it.
Yes, uncrimped staples are a pet peeve of mine, because of the hazard they present to other coins stacked with those holders. If you must use a regular stapler instead of a flat-clinch one, at least get a pair of pliers and pinch those staples all the way flat against the cardboard. Otherwise, if they catch on something, and one of those ends come loose, there's a lethal weapon ready to scratch any other coin that gets near that holder.