A fine <b>and</b> exceedingly rare copper-red decorated ‘Three fish’ stem cup, <b>Xuande</b> <b>six</b>-<b>character</b> <b>mark</b> <b>and</b> <b>of</b> <b>the</b> <b>period</b> (<b>1426</b>-<b>1435</b>)