It should be noted that I used a variety of sources and some state 64 clubs, others 66 but I believe they are counting the Royal Singapore GC and the Royal Hong Kong GC which became other clubs by merger (Singapore) or dropping (HK). Here are the disputed courses it appears:
Why are you omitting the Royal Bangkok Sports Club and Royal Hua Hin?
Both were bestowed their titles from the Thai Royal Family.
Brian this is just the UK Royal destinction.