Judging keris from it's picture is always very tricky for me, but that's the only way we could do here
It looks like javanese keris for me, the "nem-neman" perhaps. Nem-neman term attributed to all kerises which were made after the Giyanti Treaty, which divided the mataram kingdom in 1792, until early 20th century. 36cm long is'n't long enough for Bali kerises, but quite long for Java. Here in Java, we measure the blade by "kilan" or "jengkal" traditional unit, that is, the distance between the thumb's point and little finger while you spreading them (mine is 20cm). Average Java keris (and Bugis, perhaps Malay also) have around one and a half kilan long, while bali keris might well over 2 kilans.
"out-of-blade" greneng profile is called "ron dha nunut". Greneng term is only used specifically for those thorn-like shape on ganja's tail. Once it come to the blade, it is called "ron dha nunut" nunut= to follow, ron=daun=leaf, dha=the "W"torn-like shape, which actually resembles the "dha" character on Javanese alphabet. the greneng on the sekar kacang is called "jenggot" or beard. Mpu put/made the greneng, ron dha nunut or jenggot on the blade according to the dhapur/blade shape he wished to made. There were a rule, not just for it's beauty, especially in Java. There always a name and meaning for every ricikan/blade details and luk. But for now, just admire the beauty
It's true that the greneng shape might be the indicator for the age, but it's the "W" or dha which is used, not the "out-of-blade" or "within-the-blade" profile, at least here in Java, for what I've learnt. Some even believe that the greneng are actually the "hand-signature" of the empu.
I don't hold my opinions as to be the right ones. I just want to share what I've learnt, and to learnt much much more. Please do not feel offended
Anyway, good keris, Wolviex. Just wonder, how it could travel to Poland
The pamor is beras wutah, and the dhapur might be Carita Kanawa, 9 luk. I don't bring the dhapur book, just relying my memory, so I couldn't assure you, sorry