Gustav, I keep on telling you that you see things differently to the elite keris authorities of Central Jawa, and to me (but I am no Elite), but I have not yet explained how different. 
 
Here is a short list of major indicators that we bring into consideration when trying to determine the classification of a keris blade. 
 
Under each of these heads there are characteristics that can be representative of characteristics found in each established tangguh. I am not going to name these characteristics, nor attempt to explain them, the words & concepts are mostly Javanese and we need to adopt a Javanese frame of reference to achieve entry level understanding, usable understanding can only be achieved through personal tuition on a face to face basis and with access to good examples. 
 
These days there is a multitude of tangguhs, and a lot of these have appeared over the last 30 or so years, they would not all have been recognised as legitimate, in Solo, during the 1980's. 
 
Here I also provide a short list of major, recognised tangguh classifications. 
 
Major Tangguh Classification Indicators as used by Empu Suparman Supowijoyo 
 
Tanting 
Besi 
Pamor 
Baja 
Pawakan 
Gonjo 
Gandhik 
Blumbangan 
Sogokan 
Ada-ada (odo-odo) 
Kruwingan 
Eluk-lukan 
Wadidang 
 
Major Tangguh Classifications as used by Empu Suparman Supowijoyo 
Accepted as Javanese 
Jenggolo 
Pajajaran I 
Pajajaran II 
Mojopahit 
Kahuripan 
Pengging 
Segaluh 
Tuban 
Pajang 
Mataram Senopati  
Mataram Sultan Agung 
Tuban Mataram/Pajajaran/Mojopahit 
Kartosuro 
Surakarta 
Koripan 
Godean 
 
Accepted as outside Jawa 
Madura 
Kupang 
Bugis 
 
It is important to note that these classification names cannot necessarily be understood in a way that the name itself would seem to indicate, classifications can refer to era, or geographic location, or society, or culture there are other un-named classifications.  
Tangguh classification should be understood as the name of a classification only, other meanings should not be read into the name in the absence of expert guidance.
		 
		
		
		
		
		
		
		
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