I've never seen or heard any referances to Frank actually being a black belt. If I remember Mr. Parker's story right; it was that Frank showed him some stuff, but ran out of material and sent him to William. Very, very few people actually got black belts from William Chow (not counting people who were already black belts and got promoted higher by Chow). There would be Adriano Emperado, Fred Lara, Masaichi Oshiro, Paul Yamaguichi, Abe Kamahoahoa, Bill Chun Sr., Ron Alo, John Chow-Hoon, Charles Kuihana, Sheryl Kuoha, etc. I mean in Hawaii, if you had a black belt from Prof. Chow, it was like gold, and everyone knew about it. And if you claimed to have one, and really didn't, he'd be knocking on your door, and the claim would no longer be made.