年份：1970年代中期
工序：生茶
茶廠：勐海茶廠
倉儲：自然倉/傳統香港倉
數量：八片
總重量：約311g, 317g, 304g, 309g, 306g, 295g, 304g, 305g
This lot has been well-preserved in a natural or Hong Kong warehouse. This version of "Green Letter Yellow Mark" is an earlier iteration within the Yellow Mark series. The inner ticket indicates that it is the "Serious Formula", which is regarded as the finest and earliest variation compared to the others, namely "Moderate Fermentation" and "Intensified Sprouting". Due to its rarity, only a limited quantity is available.