TongXingHao is oldest factory in YiWu area dated back to 1732 specializes on high end teas.
Quality of this cake is also very high. It was stored very nicely for around 40 years, both in HongKong and later in Taiwan. 
Chestnut red brew is deep and mature with many layers of ginseng, oak wood and cacao notes. 
Effect is calm and meditative.