19th century corvo for discussion

[Sajen]

Thanks to all for the interest. All that I personally know about the history of corvos Jim has summarized already.
I have attached a picture of some old/antique so called "Hippen", German pruning knives. Vintner knives from Germany and France have a very similar style. So the development is better visible.

Why do I think that my new one is an old/early one? First, look to the used handle material by this one and the ones posted in #4, it's always brass and/or copper between horn and/or bone, in one case it's leather (the one with black handle and ruler), by the ones I've posted in #5 you see by the stacked handles always stained disks.
Second, look at the bolster area, by the ones posted in #4 they nearly always worked very rusticly, they developed to the typical fat point seen by nearly all examples in #5.
This is what I have noticed and let me think that the ones with tang in up could be earlier, like said, a theory.