Troy,
There are no ERIE oval roasters. The photo Greg posted of the cover is a slant/Erie.
In the December, 1955 Griswold "News Letter" they are offering:
"The Mill Room has a supply of small black iron Oval Roasters and Covers on hand that can be bought for scrap as is (as is is underlined) at 7cents per pound. Any employee interested in purchasing these Roasters may order through Keith Beebe at the store."
I don't know if Griswold made a practice of selling seconds or imperfect pieces that way, or if said roasters were first quality, but, if they did, perhaps the oval roaster in question on ebay was one such piece. Maybe the handle was broken or not properly formed, was cut off, and the current "stove" handle put on. Who knows? I still would guess that oval roaster is not a piece from Griswold without seeing it.
Steve