my last keris

[David]

Originally Posted by Marcokeris

and are not rare case

Of course it's rare. If someone like Alan Maisey states that "in over 70 years of handling & seeing keris I believe I have never seen an (apparently) professionally mounted keris set into its scabbard back to front" i don't know what else to call it.
You seem to be responding very defensively to remarks about this presentation. Obviously we aren't arguing with the fact that it exists and that others exist that are also mounted in this manner. The evidence is clear that examples exist.
I am not convinced that the reason is a simple as it could not enter the sheath properly if it wasn't reversed though. It still leaves us with the question of why is this the case and why do we have these blades that ignore the Javanese concept of condong leheh.