Salaams all  

 ~ An interesting excursion and vignette into the cultural and traditional influence of the Portuguese upon Sri Lanka is nicely outlined at 
http://www.lusotopie.sciencespoborde...jayasuriya.pdf 
Perhaps more to the point...an outline of the Gannoruwa battle in which the Portuguese were routed is at 
http://en.wikipedia.org/wiki/File:Ki...08-1687%29.jpg and artwork already recorded at forum showing the type of sword is recorded there... Although this is relatively updated 
artwork it does appear to have been copied from a 1693 book thus may well be accurate and in describing the lodgement of the kings sword "A Kastane" in the national shrine ...after the battle. 
 
Regards,
Ibrahiim al Balooshi. 
