Dear Mr Hidayat and All,
Tangguh is not a certainty. The word itself shows, that the meaning of "nangguh" (in keris term) is "guessing the period of making, based on specific details of the keris or spear"). If I say: "My keris or spear bears tangguh Pajajaran or Pengging, or Majapahit", once must be understood to as "supposed to be made in Pajajaran period" or possibly, "supposed to have Pajajaran style,". Many kerises, supposed with certain tangguh, actually was made in the different period after.
From time to time, "knowledge" on tangguh is an oral and visual knowledge. One learns (or knows) tangguh, from seeing blades or spears. Sometimes from written opinion in the past, but really difficult to imagine the reality, without seeing examples. What I've known about tangguh, also seeing from thousands of kerises from hundreds of keris owners. Either they were keris collectors, or royal family (kerabat keraton), or at least from people which has collection of old heirlooms. You may find such source in Surakarta (Solo) or Yogyakarta.
"Nangguh duwung" (guessing the period of making the keris), is always debatable. In my experience, other people can be other opinion on tangguh. But at least, there are certain compromises in specific details, like specific luks, the shape of ganja, the shape of kembang kacang, the sogokan (pajang style, if I'm not mistaken, has a specific form of 'bawang sebungkul' -- form of sogokan base in the keris, not form of pamor --), and tangguh pengging with very specific luks usually (not certain) not more than five luks.
Some Mataram style, has rengkol luks too. (See pictures below, spears supposed to be from tangguh Mataram Senopaten, or Senopaten style at least). One decides tangguh, also from the iron of the blade. Tangguh Sedayu (actually, Sedayu is the noble name of empu Supamandrangi in Majapahit period or he wore name Empu Pitrang in Blambangan. Sedayu, very wellknown of its specific 'black' iron which is only known by seeing it.
Like Pengging, was not a period of a kingdom. Pengging was only a Kadipaten in the period of Demak Islamic Kingdom. Pengging under Ki Ageng Pengging (formerly Ki Kebo Kenanga), disobeyed the King of Demak as a result of 'different aliran of Islam' with Demak -- see 'stories' on Syech Siti Djenar -- and Pajang period, is a very short Kingdom after Demak, but just before Mataram (Sutowijoyo, or Panembahan Senopati).
From which tangguh? Let's guessing your keris, afterwards...
Ganjawulung
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