Our scan shows you the front of the paper cover and one of the four cards in this set, MC (E)-23, issued by China National Philatelic Co. in 2022.  The ancient towns include Nanyang (Weishan, Shandong), Anhai (Jinjiang, Fujian), Logmen (Fuyang, Zhejiang), and Ruili (Xifuliang).  These are high-class, engraved postcards.  Grade: 1