Here are a couple of neat items. From the Song Dynasty a bowl and dish (though the dish may be Ming, not sure yet. Only had them 25 years, should be enough time to properly attribute!): The bases are inscribed, the bowl 天位乙, sky or heaven, a place, two(?). It refers to the artist or workshop and the lot number of the pottery batch. The dish is inscribed simply 五, or Two, again either the worker or batch number.