I may have Jens, I've actually got two, probably around 1900, in pretty poor condition and lacking their cross handle, which in the Javanese version of these is wood. However, I'm afraid that at the moment I am not able to access where I have these stored.
If you go here, and scroll down to the first showcase pics, there is a Solonese katar in the left case.
http://www.kerisattosanaji.com/radyapustaka.html
Only a small image, but the salient details are clear.
No, I have not seen that book.
It seems that it is available online. I've just done a quick scan of contents and much of what I have just seen is familiar to me.
In respect of the Holstien plates you have posted, are any of the items shown here dated?
If so, I would appreciate your advice of any item reliably dated to before 1700.
Thanks,
Alan.
Photo of Jawa katar in Musium Radya Pustaka, crop from a very much larger image. My apologies for quality