Sorry mock, but because of the relatively poor quality of the images, all I can tell for certain is it's not oak. Being reddish, and seemingly of medium textured grain, it might be, as Chrispy suggested, iroko. But a small list of other candidates, given the previous use as windowsills, might include woods such as sapele, an African mahogany, and even possibly one of the more durable of merantis. Slainte.