The lady I bought it from is indeed from South Africa, so that makes sense then. As for warranty? I think by the styling of the manual and the machine itself I'd say it was vintage 80s or 90s at the latest so I'll not worry about that I think.
That solves the riddle then about the overlocker. I maybe, didn't explain myself so well but the reason I meant to look up further info from the manual was to work out where the model may have come from but it seems the Janome Finesse may be imported and sold under licence in South Africa. I couldn't work out the age of the model you have but would imagine the Janome overlockers in the UK must have/had a similar model but doesn't have the word finesse in its title?
My first overlocker was a Janome (I still have it) and Janome are a great make. Should last you a long while.