Hullo everybody,
My twee-duit's worth:
I managed to rescue a KM from neglect. It had traces of chrome plate on the guard, scabbard etc. However, it was pretty much rusted. So, I decided to do an immediate cleaning. As the item was located in ..... wait for it ..... HAWAII (of all places), I decided on fruit juice as the cleanser. I disassembled it and cleaned. All parts were original to the piece. (see attached photo; please don't step on my toes

)
I noticed that the serial no. had no 'KM' prefix. I sought a definitive answer to this, but to date, have had no reply from any Dutch authority/museum.
However, I seem to remember that the Leger Museum in Delft has KM's that are with and w/o this prefix.
Please enlighten me.
Best,