If this gonjo had what we call nguceng mati form, with the tail coming back to a distinct point, I would be prepared to accept the slightly pointed sirah cecak as Tuban, its not really rounded enough for Tuban, but it would pass with a push. However, that gonjo tail has a slight curve and the end is more or less squared off. This is not acceptable for Tuban.
There's another thing too, I cannot really see the blade cross section, I'm not sure if it is ovoid enough for Tuban, in a couple of pics it looks like it could be slightly raised down the mid-line of the wilah, not really an ada-ada, but not rounded either.
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