I have also seen AC Delco Classic 15" blades listed. They look the same as the Trico's. Probably the same manufacture as they are all made in Mexico, but at least that is not marked any where on them.
What bothers me is that there are now people on ebay selling the new classic blades as NORS which is "new old replacement stock". I believe that is a stretch of the truth. I have also seen some go as far as listing them as NOS. What they do is remove the original packaging and then sell the blades loose with a jacked up "Buy it Now" price.