With 63-Down, priceless porcelain piece (4)

I believe the answer is:

ming

(Other definitions for ming that I've seen before include "Chinese dynasty - Flash Gordon's foe" , "An imperial Chinese dynasty" , "Chinese dynasty noted for porcelain" , "Chinese dynasty and Roscommon TD" , "Mediaeval Chinese dynasty, ware" .)

I've seen this clue in the LA Times.

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