Sid, the tangguh system is really not all that difficult to come to terms with if we just regard it as a system of classification.
For relatively recent classifications, such as Surakarta, we can use it as an approximate guide to age, but the further back in time we go, the less we can think of it in terms of age.
I feel that for Sultan Agung forward it is probably a more or less reliable way to get a ballpark approximation of age, but back before this I tend to regard it as a system that is more likely to indicate place of origin, rather than time of origin.
I'm using words like "tend" & "feel", this is because what I have written is a statement of my personal belief, which is probably as good as anybody else's personal belief.
Bear in mind that tangguh is a value indicator that is tied to perceived honour, it was never intended to satisfy the curiosity of collectors, it was intended to help Javanese noblemen with their investment decisions.
However --- at the present time it is used by many people who do not really understand it, to jack up prices. Koripan almost always becomes Mataram Sultan Agung, Tuban Majapahit gets presented as Majapahit, & so on.
Just stick with it as a classification system and you won't go far wrong.
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