I grabbed another CI pan yesterday at a thrift store for $4... it was a bit crusty but I could tell it was a smooth cooker. The bottom appeared to be Eaton's brand which probably doesn't mean much to anyone out there who isn't Canadian.
As with all the crusty iron I pick up, I gave it 40 minutes in the self clean to get the old goop off and see what I'm working with.
Well what a gem. This pan is stamped "The T. Eaton Co. Limited Housewares Department". Side by side comparison with my Griswold 8 shows that it is so close in shape that it could be from the same foundry. I believe however that it was likely cast in Canada and was meant to be a very close knock off of the Griswold, down to the handle dimensions and the font used for the size numbering. It is about 10% heavier - not noticeable in hand but it shows on the scale.
My advice to anyone looking for their first pan is to splurge on a known good one - griswold or wagner, or at least spend some time handling one at a flea market (if you can find any there). Once you see the difference and feel it in your hands you will know what you're looking for at the thrift stores and you'll soon find your collection growing.
The cooking surface is significantly different on the better pans, and on some you can even see the machining marks (My barely used wagner has very obvious machining marks - I believe griswold must have performed further polishing to achieve their super smooth surface).
Don't be snooty about brand. I have seen some unbranded pans with a stamp that says "Taiwan" which have great surfaces. They may not be quite up to griswold standard but they are going to become good cookers faster than any modern pan made from melted down engine blocks.
I have found so many (mostly smaller) pans at thrift stores that I usually pass them up now. I have been giving cast iron out to friends too, but it's getting to the point where I can't justify it unless it's a large pan under 10 bucks.
The more of us who know what we're looking for, the better - once these things get thrown to the curb and eventually scrapped, they'll never come back. I'd rather blow $10 on a pan and pass it to a friend (with good instructions) and know it's going to be appreciated than pass it by and risk it disappearing forever.
I believe that there should be laws forbidding scrapping of cast iron pans and bicycles