....................... My KJN opened a school in 1969, teaching Moo Duk Kwan "Korean Karate." I'm sure it was more of a case of running in circles you were familiar with, but we had various MDK masters visit our promotion examinations and tournaments through my early years, as well as representatives from Jidokwan, Song Moo Kwan, and various other kwan.
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I do know that Sok Ho KANG (my KJN), Il Joo KIM, Kyongwon AHN, S. Henry Cho, Ki Whang KIM, and Jae Chul Shin all opened schools in the 1960's and were not of the ITF or Oh Do Kwan lineage.
Joon Pyo CHOI, Young Pyo CHOI, Song Oh MOON, Chun Shik KIM, and Choong Woon KIM all opened their schools in the early 70's.
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I'm not asserting that you are wrong Master Weiss, I just didn't realize that the ITF/Oh Do Kwan was that prevalent throughout the U.S. in the 60's and 70's. Thanks!