"7581" is a series initially produced by manual fermentation( Wo Dui). Blend recipe from 1975 year using 8th grade tea materials mainly and produced in Kunming tea facotry.
Sweet and smooth.
Mellowness with aged character.
Well recommended for old tea drinker to improve tea experience only.
Guangzhou natural storage with some wet storage like smell but it doesn't affect the taste and flavor. If you feel nervous about that, please be cautious.
Till around 2005 to 2007 year, puerh tea hadn't been so famous and welcomed like nowadays.
So from producers, dealers to collectors didn't pay much attention on the storage condition. That is one of the main reasons why people can find dirty things in tea including shell of sunflower seeds, hairs even cigarette butts.
Especially in Guangdong province, due to the long lasting summer with high humidity and temperature, tea may get wet storage characters easily. Then it is not suitable for drinking. We ourselves don't drink it too.