I found this little chip on the beach today.  It's quite small, but I'm fairly sure it's a piece of a Chinese export porcelain coffee cup, made in about 1715.  It would have been blue and white originally, then decorated in London c.1730 with iron-red to give the effect of more expensive and fashionable Imari.  It's rather fine: the unbroken ones I have are a cheap and cheaply decorated version (probably from a commercial establishment), but sweet all the same.  Anyone with any other ideas?