Every Erie skillet I have ever owned or seen also had the cooking surface ground. Carborundum (the first ever man made abrasive and the first material that could grind cast iron) was invented in 1880 and within a few years was an industry standard. Just about any hollow ware manufacturer worth their salt was grinding their cooking surfaces flat. Considering this was about the time that our beloved "ERIE" skillets were brought to market...
Plenty of smaller foundries rather gleefully copied whatever pans they could get their hands on. Wapak and Martin were two of the larger ones that at least made an effort to cover up their piracy, with mixed results. It would not surprise me to find out that someone else did it too and made even less effort to hide it.
This may look superficially like an Erie, but I'd peg it as a contemporary pirated copy, and a poor one at that.
