In those days Swing Journal was reputed to have the largest circulation of any jazz magazine in the world.
Also the cover always included a headshot of one or another straight-ahead player.
I recently found an interesting cover of Swing Journal at JazzWax.Go here
At second time Sadao Watanabe(渡辺貞夫) held concert on March 15, 1969.
Sadao performed to tribute the 13th anniversary of Charlie Parker.
It was issued “SWING JOURNAL JAZZ WORKSHOP 2 SADAO WATANABE DEDICATED TO CHARLIE PARKER” by Tact label.
Here is Sadao Watanabe Plays “If I Should Lose You”.
Here is Sadao Watanabe with Modern Jazz All Stars plays “Confirmation”.