Hi,
Feel free to use the picture.
I will try to get a better picture of the metal swivel and it's attachment point. The swivel is actually quite rusty and bent out of shape a little. Photo's do tend to hide these details.
Another detail that is not obvious on the photo are the wearing marks that are visible near the top of the cord, where it would be worn around the shoulder strap.
The leather has the smell only old leather has, so at least I'm convinced it's not recent, but perhaps too young to be Portugese. I will push my former-KM contact for more information
Also note that the KM was not an organization that cared much for standardisation. Take a look at the holsters they used: About any version that was usable was used in a number of colors like black, brown and white. So it wouldn't surprise me if the KM actually used lanyards that were originally designed for other countries.
I'll do some measuring as well...