Picked it up for a song recently. I suspect it to be a BSR but it's kind of weird. Also, why is it so clean and skinny? It looks like aluminum but it's labeled as CI.
This is a nickel plated griswold. Nickel plating is something they did at the factory on some skillets because there was some section of the population back then who were obsessed with nickel plating.
As far as the center logo being gone, there was a time when natural gas piped to the home wasn’t as refined and still had sulfur in it and during combustion it produced a minute amount of sulfuric acid which over time caused pitting in the bottom of skillets
It seems like the FDA has approved nickel plating for cooking, with the worst of it being for those who are allergic to nickel (like myself!). I am going to put at least two layers of seasoning over it. I imagine it shouldn't be a problem, but at the very least I'll talk to the customer about it before I sell.