Hello Detlef,
It would be very difficult to make photos good enough so one can see the rhino horn structure as I do not have a good camera.
Will give it a try as soon as it will be a sunny day. This weekend is pretty dark and rainy.
PS: Yeah, most rencongs have pretty distinctive blade. Most tumbuk-lada also have a distinctive blade.
Most but not all...
I had a couple of rencong that had exactly sewar blades.
PPS: Have you examined the second one from the bottom in your photo at high magnification?