The engravings on the blades I never have seen by old examples, only by tourist or collector swords.
Compare!
http://www.vikingsword.com/vb/showth...highlight=jian
http://www.vikingsword.com/vb/showth...highlight=jian
http://www.vikingsword.com/vb/showth...highlight=jian
http://www.vikingsword.com/vb/showth...highlight=jian
http://www.vikingsword.com/vb/showth...highlight=jian
There are more jians shown here, look also sold pieces by dealers, not one jian which I can remember was described as authentic have had this engravings on the blade. But like said, I know next to nothing about them but we have members here who can give a very educated opinion.
Regards,
Detlef