Jerry,
In looking further, it does reference to an earlier edition but
doesn't mention the number. I get the feeling that AL-6 was
replaced with AL-7 when plastic arrived on the scene. I'm not sure I've got anything else but will poke around and see.
Dingelfutz - Now that brings back some memories. Those Kwik Serts
were indeed pattern tighteners and have used many of them.
Ahh for the old days!

Best to all,
Chris