Hi Emanuel,
the majority I have seen do have the shaped blade you describe.
Some examples..
http://www.vikingsword.com/vb/showth...highlight=tebu
http://www.vikingsword.com/vb/showth...highlight=tebu
http://www.vikingsword.com/vb/showth...highlight=tebu
However, I was under the impression that there were local variants in blade shape but, due to handle/pommel characteristics being the same,they were all classed as 'Tebu'
Regards David