From China Post in 2009, a complete set of 21, 4″ x 7-1/4″ cards having pre-printed postage and each with extensive Chinese captioning and explanations on front and back.  Our scan shows the front of the (paper) cover and a sample card.  “Yunnan Impressions” is an established group, and this set might wear you out as surely as if you were performing with them.  Grade: 1