Dan:
The only possible connection I can find is from a 1971 OPC Bazooka Hockey box, where the printers initials (JHL or HJL) appear on a flap:
I asked Bobby Binder (Vintage Hockey Collector) about what the initials might stand for but he didn't know and I have not had much time to pursue it since. Since it's a box and Canadian, maybe that is an avenue to pursue. I would think the firm was in the Toronto/London area.
My original blog post on it is here:
http://toppsarchives.blogspot.com/se...&max-results=7