I have one just like that Sandy. It was made by Wagner, after they bought out Griswold. It was made using a Griswold pattern, and you will see this same pan with Griswold marked right on the bottom.
This one would have been sold with a paper label, and may have said Wagner, or Griswold.
A nice Griswold one in good shape will sell for $600 on eBay. Ones like this, if it cleans up good and has no issues, will usually bring $200.
Chris