Looking for some help with dating this skillet. It's a #14, but no EPU. Where you normally see the catalogue number it's marked 15 inch. I was told this was made by Wagner, though it has the Griswold late large logo. So was it made by Griswold or Wagner? Where was it made, at the Griswold foundry or at the Wagner foundry? What would be a fair value on this skillet?