Tabouka ? blade markings - makers mark ?

[dugsey]

I have an old sword which I believe is a Takouba, it is very basic, there is on the blade a mark,actually an identical pair of marks, with one each side of the Fuller where the shorter fullers ends. There is probably a correct name for them, but to me they look like two halves of a broken egg, with the broken bits facing away from the central Fuller. The sword is very basic, the only decoration is some crude markings on the guard, two six pointed stars on one side, the other side looks as if it had markings but they have worn away. (Through being carried ?)
Can any one help please do you know what this mark means, I have just started collecting, am am keen to find out more.I know this sword has been in the same family in UK for at least 50 years and was purchased in Africa. I have not been able to find any information on sword makers marks although I know they exist. Any advice would be much appreciated. Thanks.