I have seen many, many of these Wagner "Grid Bottom" Skillets.
The link below is accessible to WAGS MEMBERS ONLY....
http://www.griswoldandwagner.com/cgi-bin/yabb/YaBB.pl?num=1397241095/21#21Any and all advertising indicates that the Grid Bottom Skillets, which is what Wagner Called them, were all Teflon Coated.
The color of the Teflon Coating varied depending on whether it was sold as a 'Wagner', or... a Griswold....
I also have a bit more information on these since the referenced post above.
Including an expanded list of pieces beyond the ADS shown in the link above.
Hopefully someday soon, I will be able to post the information to the WAGS Foundry list or PDF section.(Secure sections)... :) :)