Bjorn, here are some images that will be of use.
The drawings are from the hand of Empu Suparman Supowijoyo, and have been taken from a lecture that he gave in about 1980.
The page of images showing greneng forms attributed to various empus is from Haryono Haryoguritno's "Keris Jawa".
The various forms of greneng are from "Keris Jawa" also.
The two pages of text are from Raffles "History of Java".
In respect of the greneng forms attributed to Surakarta empus, it is not clear in the book, but in private conversation Haryonoguritno is reported as having said that in all honesty he was unable to distinguish the work of one empu from another. I have heard this from two people, who have no connection with each other. Thus, "attribute" is the correct way to look at these greneng.
As with much else --- some would say "all else" --- to do with the keris, the attribution of various forms of greneng and ron dha to various classifications (tangguh) is an item of belief. However, it is a crucial item of belief, because where a ron dha is found in a keris it is the key element in assignation of a tangguh.
But this can be confusing, because some extremely good quality keris, that have very obviously been made according to the parameters of one tangguh, can have a ron dha that points to a different tangguh.
For example, in the current era in Surakarta the two empus who began the keris revival were Empu Suparman Supowijoyo and Empu Pauzan Pusposukadgo (Pauzan rejected the title of "empu" for religious reasons, he used the designation "Pandai Seni Keris", however he was known as an empu by everybody). Empu Suparman invariably cut a Surakarta greneng, Pauzan usually made his keris in the Mataram form and usually cut a Mataram greneng, or occasionally a variant greneng in accord with his own interpretation.
Although the gentlemen of Jakarta who exercise very great control over the current World of the Keris in Jawa have decreed that we now have a tangguh that covers all keris made since Indonesian Independence, the great empus of the current era, Empu Suparman and Empu Pauzan did not recognise this. Empu Suparman made Surakarta keris, and although this concept of "Tangguh Kamerdekaan" did not come into being until after his passing, I can assure you the very idea of this would have horrified him, he was dedicated to Surakarta. Empu Pauzan made Mataram style keris in the Surakarta era, and as with Empu Suparman, was a Surakarta Karaton Empu.
When we move outside of Jawa we find that the greneng of keris from other areas is often just notches that have no meaning at all. Because of this, and for other reasons, many old-time traditionalists in Jawa would not recognise that these "keris" from other areas were in fact genuine keris, these other "keris" were merely keris-like objects that had been made by people who did not understand what a keris truly was, and the people who carried these keris were simply trying to copy their betters without understanding anything. They were in fact children who had not yet learnt anything.
Now, it is important to understand that this was a very Java-centric attitude, but it did reflect the mindset of some people:- the Keris was holy, these imitators treated it as profane. They had no understanding.
The key to the greneng is the ron dha.
Common belief is that the form of the ron dha is a representation of the Javanese letter dha, and the various forms of the ron dha reflect the form of the letter dha at a particular time in history.
The word "ron" means "leaf" and is Krama for "godhong". It refers to the lontar leaves upon which traditional writing was done and by extension to the letters written upon those leaves. The Javanese letter "dha" equates to "d".
Aesthetically a greneng should be cut so that it appears to be identical when viewed from each side, it should reflect the true form applicable to the classification, where a feature is repeated it should be identical to the other feature, for example, if a greneng has two ron dha, each of those ron dha should be absolutely identical.
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