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But the Five String Mob... consisting of Bill Lund, Scot Shaw, Roger Freedman, Mike Towry, John Pound, and Barry Alfonso (who is he sixth string, Barri -Boy)... made their first appearance in issue 144.

Of the San Diego six, Mike Towry also had a comic shop and ran comic book ads, in CHAMBER OF CHILLS 1-5 (1972-1973).
https://viewcomiconline.com/chamber-of-chills-1972-issue-1/

And ads by Richard Alf also appear in CHAMBER OF CHILLS 10-25 (1974-1976)
https://viewcomiconline.com/chamber-of-chills-1972-issue-10/