Ooh, that's interesting. I'm not sure i have seen exactly this dhapur before either. In Javanese terminology it would fall into the Kebo/Mahesa group, but frankly i am uncertainly if such a designation has the same meanings in Bali as it does in Jawa. Perhaps somebody else knows.
The luk at the end is of course similar to damar murub in Javanese parlance, but again, i am not sure how such a feature is seen on Balinese blades.
I wouldn't necessarily argue with the 19th century attribution. And i have to say that i am really enjoying this blade. Seems like an unusual dhapur with nicely controlled pamor and form. Wouldn't mind it at all in my own collection.