Not sure who TMS (the makers) were but I think they were Canadian?
Is it wartime made? I'm not sure, it depends on when TMS were making them but I'd say that there is more than a good chance it was made during WW2, even if it wasn't I don't suppose it would look any different to one that was.
Are there any other markings on it?
the bren mag is a mk1,star ,,so it is an early one,,,,if you ever find a mk1 ,they are worth a lot of money
so my bren mag is valuable?
NO sorry its a mk1,*, only worth about £4-£8, if it were a mk1 then about £100-+
hehe ok...is it wartime though?
I think so yes ,, war time ,and probably used post war as well,,