¹Heat Ring "Slant Erie" Skillets
²Heat Ring "Slant EPU" Skillets
³Smooth Bottom "Slant EPU" Skillets. The slant logo appears to have made an encore appearance on a handful of skillet sizes after the introduction of smooth-bottomed pans.
⁴The large block logo is seen shrunken to accommodate size restrictions such as on small skillets or the undersides of lids. It is also seen in slightly varying diameters on pieces of the same pattern number, leading some to differentiate smaller instances as being a "medium logo". The term "large", however, is more properly applied to the block lettering rather than the diameter.
⁵During its period of production, the small block logo skillets underwent design changes to the handles, resulting in what are known as the early, late, and late grooved handles. The early handles are dated ca. 1939-1944. At what points the changes thereafter occured is uncertain.
⁶The medium block logo or late large TM is believed to have been a planned replacement for the small block logo, but whose development was possibly cut short by the acquisition of Griswold by Wagner Ware. Information dating it to as early as 1955 has been found.

⁷Pieces so-marked are considered to be from the period during which Wagner owned and produced a secondary brand of hollow ware in the former SHW foundry, and perhaps thereafter in the Wagner plant.
⁸Pieces so-marked appear to be from Wagner Sidney O. patterns modified to add the word "Ware" to the trademark.
⁹Configuration appears to be confined to some regular, heat ring skillets sizes #4 - #8.
¹⁰This contradicts published sources placing the "pie logo" much earlier, as early as 1915. No pie logo skillet, however, is known without a 4-digit catalog number, which is presumed to have been first used by Wagner ca. 1924. And, with the exception of a few very large sizes, pie logo skillets are of the smooth bottom design generally dated from after 1930.