Nothing wrong with this 'seme'. It looks like a good working knife/sword. It's probably not very old. This blade is most certainly made from some kind of European machete, hence the mark on the blade.
I had a look around on the internet, but up to now I couldn't find this brand name. Perhaps an older brand (before internet days) ?
An older and forged 'seme' has a typical rib in the middle of the blade. Something we don't find with the newer pieces. These are often ground down from a piece of metal or a machete (like yours).
Here's an older type :
To see some nice, older examples, go to this site
http://anthro.amnh.org/
Then choose : Collections Database (top left on this page)
Then go to : African Etnographic Collection
You will find a search engine : type MASAI and SWORD
By the way, this site is worth exploring.