"8633" series mainly uses 3rd grade tea materials according to blend recipe initiated in 1986 year and produced by XG with serial number of 3 in CNNP group when it had long been a national organization in last century.
Slight smoky flavor is lighter than most tuo cha also from XG.
Decent sweetness with smoothness.
Minor bitterness and astringency.
Little plum like flavor well gives irritation to saliva producing.
Mellow and some soft mouth feeling.
Guangzhou natural storage.
"8633" has variation on general cake and iron cake. Iron cake called as T8633 which is very hard pressed and quite difficult to pry and dissolve in boiling water. But iron cake well preserves the original fragrance from tea and the slower processing also good for producing plum like flavor and preferred by many tea drinkers.