ROOKWOOD Art Pottery Vase Brown Butterfat Lava Look Glaze Pooling 1953 #6660F Gorgeous Rookwood Art Pottery Vase 1953 #6660F. This piece features a brown background with lovely butterfat glaze pooling and a bubble lava look. Quite beautiful and a great addition to an art pottery collection. Vase is in preowned vintage condition with no chips or cracks. ***There is writing on the bottom from a previous owner.*** Please enlarge pics and ask any questions you may have before purchasing.