MBK previously known as Motobecane are a French firm that make bicycles and mopeds and are now owned by Yamaha.
Internal welding I suspect is not quite right, it probably refers to the frame being internally lugged and is thus a brazed frame. Peugeot often used internally lugged frames and they are also French :roll:
I rather like the lurid paint scheme but then I have no taste, or so I've been told repeatedly :shock: