HK-11 is definitely on my "keep an eye out" list. It's up there with the HK-876 (Denver Mint Opening) for rarity, simple eye-appeal, and historical significance. If I come across an example that I can afford, it'll probably be because someone doesn't recognize what they have (that's how I got my HK-324 (the 1904 launching of the Armored Cruiser California) and 3 examples of HK-803 (the 1919 Saviours of Victory)). I may be getting close to completing as much of the set as I ever want to; there are a lot of the late 19th century and mid 20th century medals that are just... well, ugly to me. And, I don't think I would want the KKK medal even if it was given away.
Still, I put in a request for a complete "So-Called Dollars" category around the time of the first post in this thread, and still haven't seen any progress on that. Is NGC any closer to recognizing the series as a whole on the competitive register?