This is the lid to the scarce original Atterbury milk glass fox covered dish. It can be authenticated by the in-mold mark inside: Pat'd. Aug. 6, 1889. Westmoreland purchased this mold when Atterbury went out of business around the turn of the last century, but Westmoreland pieces never had the patent mark. Kemple made a similar but less detailed fox dish in the 1950s, marked with a K.
The lid will fit Westmoreland, Atterbury, and McKee oval base dishes. It measures just under 6-1/2 inches by 5 inches across the bottom. The realistic detail of the resting fox is exquisite with a hint of fierey opalescence at the edges of the glass. There is no damage, only some typical mold line roughness along the inner rim (not chips).