Made while owned by Wagner. On the Wagner and Sidney pans from this time frame I always look for ghost marks, or buttered areas on the pan. Ghost marks are where all or some of another foundries name is found on an item. Often hard to see unless using good light and sometimes holding the item at an angle. Doesn't really add any value to the pan,but I think it is  cool to find. Buttered areas is where the other foundries name was "buttered" over to hide the other foundries name. During this time Wagner used the same patterns in both their  Wagner and their Sidney foundries. Like I said not that uncommon, doesn't really add any  value, but to me interesting. If your interested search ghost marks here and you ought to find some discussions, some spirited about ghost marks. Nice find and Welcome.