The images shown with this post come from Ensiklopedi Keris.
Sebit rontal gonjo have a "waist" between the wide part of the gonjo that the pesi penetrates (gendhok), and the narrow end of the gonjo (buntut urang).
The other major type of gonjo is the nguceng mati form, it has a buntut urang that comes to a point.
The classic Tuban gonjo is neither nguceng mati, nor sebit rontal, it looks like nguceng mati that has been cut off, so it has flat sides like nguceng mati, no waist, but the buntut urang is cut off more or less square.
There are sub-types of Tuban blades, :- Tuban -Mataram, Tuban -Pajajaran, even Tuban-Majapahit, and all these sub-types display minor differences from mainstream Tuban, these minor differences include variation in the form of the gonjo.
The Tuban gonjo is particularly recognizable because the sirah cecak is noticeably rounded, and of course, because of the shape of the rest of the gonjo, which is quite different to any other gonjo, except perhaps Segaluh, but Segaluh has the pesi placed differently, so it is easy to identify. This is the reason why experienced keris people are confident to name a blade as Tuban while it is still in the wrongko, and all they can see is the top of the gonjo.
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