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