I have a dual neck pottery vase made out of a dark reddish brown clay which contains little white pieces of rock mixed in. It is hand made, and it was formed by sealing to sides (similar to a mold, but done without machines) together. The sealing was done by just overlapping another strip of clay around the edging. The bottom has no stilt marks, and the base "goes in" or has "depth" (about an inch) unlike most pottery that has a flat bottom. It is etched in a net-like design. Any helpful information would be appreciated. Thanks. I can send more pictures to any expert who wants to take a crack at it.