I've recently come across some Pro(regular pro by appearance) that have the stamp of the Pro/Champ Firebirds. These have the "Proline" stamp with the "F" the same size as the other letters as opposed to the later regular Pro plastic the has a larger "F". These are Oqaque like the regular pro plastic and not transparent like the Champ/Pro edition. Was there an initial run of the regular Pro plastic prior to the stamp change? Just curious about where these fit - One in Red, Yellow & white ( another friend has one in white also).

I believe those are just earlier runs of what we call Pro now. I think the Pro Orcs i used to throw said "Proline" or "Pro Line" on them, but they are definitely not anything close to Champion/CE plastic.