Yes Jaga, stylistically this gonjo is a good example of a Tuban keris that retains the original gonjo form.
This form is often presented as nguceng mati (dead fish) which from above is straight sided with the buntut urang being sharply pointed, this sharp point has been caused by erosion over time, the original shape is still straight sided, but the buntut urang is cutoff short, resulting in a gonjo shorter than most other gonjos, and a very narrow buntut urang.
From the side, a Tuban gonjo should be rather thick, and the gonjo on this keris is rather thick.
Where this keris appears to fail a Tuban classification is in the nature of the pamor, I say "appears" because I cannot feel texture from a photo. If a Tuban keris has ngulit semongko pamor, that pamor should be smooth to the touch, the pamor on this keris appears to have a rough texture, and that, plus the other things we can see in a photo, puts it into the Madura box.
But I guess we could still consider a Tuban classification. It is as I think we all understand:- there are limitations to what we can do with a photo, anything relatively positive can only come with the keris in hand.
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